A086721 Denominator of Sum_{k=0..n} binomial(n,k)/(n^2+k^2+1).

1, 6, 45, 7315, 153153, 41769, 79511041331, 21348855, 4066905218805, 131035613538221483, 78880516715, 639969453457759719, 19363383331179513605, 22789387342722276537165, 536273140516034211330020937, 7023910456240830342862673322145, 55469618987976034635639339

Offset

0,2

References

W. Koepf, Hypergeometric Summation, Vieweg, 1998, p. 53.

Links

Table of n, a(n) for n=0..16.

Example

1, 5/6, 29/45, 4679/7315, 115004/153153, 40990/41769, ...

Crossrefs

Cf. A086720.

Sequence in context: A356487 A322089 A273091 * A145002 A043076 A154651

Adjacent sequences: A086718 A086719 A086720 * A086722 A086723 A086724

Keyword

nonn,frac

Author

N. J. A. Sloane, Jul 31 2003

Status

approved