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

1,2

Links

Table of n, a(n) for n=1..19.

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).

Crossrefs

Cf. A086872.

Sequence in context: A094735 A067306 A361528 * A071720 A273998 A111685

Adjacent sequences: A261062 A261063 A261064 * A261066 A261067 A261068

Keyword

nonn,easy

Author

R. J. Mathar, Aug 08 2015

Status

approved