A261065 Second column of A086872.

1, 8, 75, 840, 11025, 166320, 2837835, 54054000, 1137161025, 26189163000, 655383804075, 17709112020600, 513880482740625, 15938200818540000, 526174085058496875, 18422283260401020000, 681816379418800250625, 26597171457203972625000, 1090705672840839577396875

Offset: 1

Author

R. J. Mathar, Aug 08 2015

Keywords

• nonn
• easy

Crossrefs

Cf. A086872.

Formula

(n-1)*(n+1)*a(n) -n*(n+2)*(2*n-1)*a(n-1)=0.

G.f. x*3F1(3/2,4,2; 3; 2x).

a(n) = A001879(n-1)+2*A001880(n+2).