A269476 Column 4 of A266240.

56581525, 11100235520, 1191262520280, 92809670660096, 5875149131469024, 320744781170737152, 15658287081481903872, 700135726021459574784, 29159104554804741742080, 1145151298823440950099968, 42804391324225851826851840, 1533861483718086352674226176

Offset

7,1

Links

Vaclav Kotesovec, Table of n, a(n) for n = 7..740

Formula

Recurrence: (n-8)*(n-7)*(n-6)*(8865313032240*n^7 - 317083364299800*n^6 + 4684927154541525*n^5 - 36954847894577400*n^4 + 167489792744727732*n^3 - 434509931893116160*n^2 + 594863631325194528*n - 329506352166682880)*a(n) = 48*(n-8)*(159575634580320*n^9 - 5627712740106240*n^8 + 82146941258133330*n^7 - 643013667125582535*n^6 + 2917921647785653476*n^5 - 7719296227286609376*n^4 + 11246681386937347392*n^3 - 7567478663869195664*n^2 + 942570862638469952*n + 715530999520296960)*a(n-2) - 20736*(n-2)*(3*n - 10)*(3*n - 8)*(8865313032240*n^7 - 192968981848440*n^6 + 1624613077652085*n^5 - 6648290558122950*n^4 + 13479332779855932*n^3 - 11835869605572088*n^2 + 2032110719189792*n + 1581052254093312)*a(n-4).

a(n) ~ 37079 * 2^(2*n - 21/2) * 3^(3*n/2 - 11/2) * n^(15/2) / (3575*sqrt(Pi)).

Crossrefs

Cf. A266240.

Sequence in context: A234794 A067388 A251380 * A234759 A172593 A258422

Adjacent sequences: A269473 A269474 A269475 * A269477 A269478 A269479

Keyword

nonn

Author

Vaclav Kotesovec, Feb 27 2016

Status

approved