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 A047677 Row 2 of square array defined in A047675: 2*n!*(n+1)!. 2
 2, 4, 24, 288, 5760, 172800, 7257600, 406425600, 29262643200, 2633637888000, 289700167680000, 38240422133760000, 5965505852866560000, 1085722065221713920000, 228001633696559923200000, 54720392087174381568000000, 14883946647711431786496000000 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 COMMENTS a(n) = A152877(2n+1, 2n-2) for n > 0. - Alois P. Heinz, Nov 10 2013 LINKS MAPLE a:= proc(n) a(n):= `if`(n=0, 2, n*(n+1) * a(n-1)) end: seq(a(n), n=0..20);  # Alois P. Heinz, Nov 11 2013 MATHEMATICA 2*Times@@@Partition[Range[0, 20]!, 2, 1] (* Harvey P. Dale, Sep 25 2017 *) CROSSREFS Cf. A047675, A010790, A152877. Sequence in context: A038058 A062531 A141599 * A030276 A081476 A241806 Adjacent sequences:  A047674 A047675 A047676 * A047678 A047679 A047680 KEYWORD nonn AUTHOR STATUS approved

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Last modified September 24 17:09 EDT 2020. Contains 337321 sequences. (Running on oeis4.)