SOLUTION: 1,1,2,4,6,18,21,?

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Question 1100246: 1,1,2,4,6,18,21,?
Found 2 solutions by richwmiller, ikleyn:
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
1, 1, 2, 4, 6, 18, 21, 84, 88, 440, 445, 2670, 2676, 18732, 18739, 149912, 149920, 1349280, 1349289, 13492890, 13492900, 148421900, 148421911, 1781062932, 1781062944, 23153818272,
Multiply by 1, add 1, multiply by 2, add 2, etc.
also see https://www.algebra.com/algebra/homework/Sequences-and-series/Sequences-and-series.faq.question.884472.html

Answer by ikleyn(52788) About Me  (Show Source):
You can put this solution on YOUR website!
.
Also see
https://oeis.org/A019464

https://oeis.org/A019464