Description

This article is from the Puzzles FAQ, by Chris Cole chris@questrel.questrel.com and Matthew Daly mwdaly@pobox.com with numerous contributions by others.

459 series/series.20.p

1 2 5 16 64 312 1812 12288

series/series.20.s

ANSWER: 95616
The sum of factorial(k)*factorial(n-k) for k=0,...,n.

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