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URL: https://oeis.org/A047677

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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
OFFSET
0,1
COMMENTS
a(n) = A152877(2n+1, 2n-2) for n > 0. - Alois P. Heinz, Nov 10 2013
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
KEYWORD
nonn
STATUS
approved