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URL: https://oeis.org/A056981

⇱ A056981 - OEIS

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A056981
a(n) = A002596(n)^2.
1
1, 1, 1, 1, 25, 49, 441, 1089, 184041, 511225, 5909761, 17631601, 863948449, 2704312009, 34493775625, 111759833025, 93990019574025, 312541206957225, 4201942893536025, 14258670483605625, 780804795682244025
OFFSET
0,5
COMMENTS
Numerator of h^(2n) in the Kummer-Gauss series for the perimeter of an ellipse.
LINKS
Eric Weisstein's World of Mathematics, Gauss-Kummer Series.
Eric Weisstein's World of Mathematics, Ellipse.
MATHEMATICA
Numerator[Table[Binomial[1/2, n]^2, {n, 50}]] (* Artur Jasinski, Aug 30 2016 *)
CROSSREFS
Sequence in context: A146641 A171590 A322434 * A132585 A049228 A309828
KEYWORD
nonn,frac
EXTENSIONS
New description from N. J. A. Sloane, Feb 18 2004
STATUS
approved