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

Question 1100246: 1,1,2,4,6,18,21,?
Found 2 solutions by richwmiller, ikleyn:
Answer by richwmiller(17219) (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) (Show Source): You can put this solution on YOUR website!
.
Also see
https://oeis.org/A019464

https://oeis.org/A019464

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