document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1038711>Question 1038711</A>: <I><SPAN STYLE=\"word-break: break-all;\"> What should be the next number in the following series? 1 2 8 48 384 _ ?_ </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #653439 by </B><A HREF=/tutors/aboutme.mpl?userid=rothauserc><B>rothauserc(4718)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=rothauserc><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/cgi-bin/show-face.mpl?user=rothauserc><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=653439\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> this is the double factorial of even numbers<BR>\n" );
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document.write( "(2n)!! = (2^n) * n!<BR>\n" );
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document.write( "begin with n = 0<BR>\n" );
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document.write( "a(0) = 1<BR>\n" );
document.write( "a(1) = 2<BR>\n" );
document.write( "a(2) = 8<BR>\n" );
document.write( "a(3) = 48<BR>\n" );
document.write( "a(4) = 384<BR>\n" );
document.write( "a(5) = 3840<BR>\n" );
document.write( "a(6) = 46080<BR>\n" );
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document.write( "1, 2, 8, 48, 384, 3840, 46080<BR>\n" );
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