A095159 -id:A095159 - cp's OEIS frontend

A095175 Denominator of b(n) given by b(1) = 1, b(2) = 2; for n >= 3, b(n) = (-1)^n (2n-1) ((n-2)!!)^2/((n-1)!!)^2, where n!! is the double factorial A006882.

1, 1, 4, 9, 64, 225, 256, 245, 16384, 99225, 65536, 480249, 1048576, 1002001, 4194304, 41409225, 1073741824, 2393453205, 4294967296, 4102737925, 68719476736, 940839860961, 274877906944, 4113258565689, 17592186044416, 16802526820625, 70368744177664

Offset: 1

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N. J. A. Sloane, based on a suggestion of Leroy Quet, Jul 03 2004

nonn
frac

A095159(2n)/a(2n) -> pi as n -> inf.; A095159(2n+1)/a(2n+1) -> -4/pi as n -> inf. - Leroy Quet, Aug 03 2004

Cf. A006882, A095159.

cp's OEIS Frontend

A095175 Denominator of b(n) given by b(1) = 1, b(2) = 2; for n >= 3, b(n) = (-1)^n (2n-1) ((n-2)!!)^2/((n-1)!!)^2, where n!! is the double factorial A006882.

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