A072118 a(n) = (2*n)!/core(n!)^2/(n+1) where core(x) is the squarefree part of x.

1, 2, 5, 224, 672, 2737152, 8895744, 474439680, 130660687872, 4513732853760000, 15798064988160000, 894413525483520000, 3194334019584000000, 27610545531676262400000, 8107146431738442547200000

Offset

1,2

Links

Table of n, a(n) for n=1..15.

Prog

(PARI) for(n=1, 50, print1((2*n)!/core(n!)^2/(n+1), ", "))

Crossrefs

Sequence in context: A096695 A084297 A041873 * A249180 A135724 A137068

Adjacent sequences: A072115 A072116 A072117 * A072119 A072120 A072121

Keyword

easy,nonn

Author

Benoit Cloitre, Jun 19 2002

Status

approved