A193477 a(n) = denominator(n!/floor(n/2)!^4).

1, 1, 1, 1, 2, 2, 9, 9, 288, 32, 400, 400, 43200, 43200, 1058400, 70560, 18063360, 18063360, 6584094720, 6584094720, 3292047360000, 156764160000, 9484231680000, 9484231680000, 8194376171520000, 327775046860800, 27696991459737600, 1025814498508800

Offset

0,5

Links

Table of n, a(n) for n=0..27.

Formula

a(n) = denominator(A056040(n)^2/n!).

a(n) = denominator(A056040(n)/floor(n/2)!^2).

Maple

A193477 := n -> denom(n!/iquo(n, 2)!^4);

Crossrefs

Cf. A055773 (numerator).

Sequence in context: A229594 A059199 A010765 * A193726 A143022 A154100

Adjacent sequences: A193474 A193475 A193476 * A193478 A193479 A193480

Keyword

nonn,easy

Author

Peter Luschny, Jul 30 2011

Status

approved