A269474 Column 2 of A266240.

105, 8112, 396792, 15663360, 544475232, 17388675072, 522638463744, 15007609257984, 415870219556352, 11199568168353792, 294628320168579072, 7600751972236394496, 192860109239084236800, 4824494454867178291200, 119207140785929743368192, 2913796518104633469566976

Offset

3,1

Links

Vaclav Kotesovec, Table of n, a(n) for n = 3..750

Formula

Recurrence: (n-4)*(n-3)*(n-2)*(2100*n^3 - 22577*n^2 + 77702*n - 86760)*a(n) = 48*(n-4)*(37800*n^5 - 463086*n^4 + 2015601*n^3 - 3767956*n^2 + 2822996*n - 645120)*a(n-2) - 20736*(n-2)*(3*n - 10)*(3*n - 8)*(2100*n^3 - 9977*n^2 + 12594*n - 4864)*a(n-4).

a(n) ~ 7 * 2^(2*n - 9/2) * 3^(3*n/2 - 3/2) * n^(5/2) / (5*sqrt(Pi)).

Crossrefs

Cf. A266240.

Sequence in context: A359991 A199353 A263888 * A255497 A094075 A199519

Adjacent sequences: A269471 A269472 A269473 * A269475 A269476 A269477

Keyword

nonn

Author

Vaclav Kotesovec, Feb 27 2016

Status

approved