A060075 Third column of triangle A060074.

1, 14, 331, 12284, 663061, 49164554, 4798037791, 596372040824, 91991577140521, 17244625801225094, 3861296322290987251, 1017889493782391701364, 312043142223584185393981, 110072908401904868672053634

Offset

0,2

Comments

Also third diagonal of triangle A060058.

a(n) is n-fold iterated sum of squares with last upper summation index 3 and other upper summation indices j[k]+1, k=2,...,n. See Comments A060061 for the threefold iteration with last upper summation index n.

Links

Table of n, a(n) for n=0..13.

Formula

a(n) = A060074(n+2, 2) = A060058(2+n, n).

a(n) = (1/4)*(A000364(n+1) - A000364(n)). - Benoit Cloitre, Apr 06 2003

G.f.: sin(x)^2/cos(x)^3 = x^2/2! + 14*x^4/4! + 331*x^6/6! + .... - Peter Bala, Oct 22 2019

Crossrefs

Cf. A000364.

Sequence in context: A241373 A090598 A277769 * A222984 A278194 A035273

Adjacent sequences: A060072 A060073 A060074 * A060076 A060077 A060078

Keyword

nonn,easy

Author

Wolfdieter Lang, Mar 16 2001

Status

approved