A061319 Column 4 of A061315.

0, 1, 10, 76, 430, 1870, 6601, 19810, 52326, 124785, 273790, 560626, 1083160, 1991626, 3509065, 5957260, 9789076, 15628185, 24317226, 36975520, 55067530, 80483326, 115632385, 163552126, 228032650, 313759225, 426474126, 573159510

Offset

0,3

Links

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

Index entries for linear recurrences with constant coefficients, signature (9,-36,84,-126,126,-84,36,-9,1).

Formula

a(n) =A061318(n)/4 =sqrt(A061320(n)-A061318(n)).

G.f. -x*(1+x+22*x^2+22*x^3+22*x^4+x^5+x^6) / (x-1)^9. - R. J. Mathar, Aug 11 2012

a(n) = n*(n+1)*(n^2+n+4)*(n^4+2*n^3+5*n^2+4*n+36)/576 . R. J. Mathar, Aug 11 2012

Crossrefs

Sequence in context: A136869 A368418 A108277 * A223994 A016149 A081199

Adjacent sequences: A061316 A061317 A061318 * A061320 A061321 A061322

Keyword

nonn,easy

Author

Henry Bottomley, Apr 24 2001

Status

approved