A316332 -id:A316332 - cp's OEIS frontend

A316330 a(n) = A000085(4*n)/2^n.

1, 5, 191, 17519, 2887921, 742458253, 273315477775, 136025604432743, 87816638377854497, 71278145791452802133, 70978809757898186241439, 85023410230409691052228255, 120545000629512292505954394769, 199558149588334620585072909701981, 381323441275017330119775857868585839

Offset: 0

N. J. A. Sloane, Jul 09 2018, following a suggestion from Doron Zeilberger

nonn

Seiichi Manyama, Table of n, a(n) for n = 0..210
S. Chowla, I. N. Herstein and W. K. Moore, On recursions connected with symmetric groups I, Canad. J. Math. 3 (1951) 328-334.
Dongsu Kim and Jang Soo Kim, A combinatorial approach to the power of 2 in the number of involutions, J. Comb. Theory Ser. A 117 (8) (2010): 1082-1094.

Cf. A000085, A316331, A316332, A316333.

A316331 a(n) = A000085(4*n+1)/2^n.

Original entry on oeis.org

1, 13, 655, 71063, 13237457, 3748521653, 1495006933759, 796798642614895, 546144645571635169, 467512355698028529821, 488384275088035513080239, 611057820865315450415912327, 901643505614430586911510015025, 1548711768835068239482321088560837

Offset: 0

N. J. A. Sloane, Jul 09 2018, following a suggestion from Doron Zeilberger

nonn

Seiichi Manyama, Table of n, a(n) for n = 0..210
S. Chowla, I. N. Herstein and W. K. Moore, On recursions connected with symmetric groups I, Canad. J. Math. 3 (1951) 328-334.
Dongsu Kim and Jang Soo Kim, A combinatorial approach to the power of 2 in the number of involutions, J. Comb. Theory Ser. A 117 (8) (2010): 1082-1094.

Cf. A000085, A316330, A316332, A316333.

A316333 a(n) = A000085(4*n+3)/2^(n+2).

Original entry on oeis.org

1, 29, 2231, 323423, 75151585, 25451905333, 11799518538967, 7161375112402823, 5503252915369107329, 5217568316626716585485, 5977663757214838174587319, 8136442760259565566724537711, 12972630954295515566319694027489, 23938932303527622015634131021262757

Offset: 0

N. J. A. Sloane, Jul 09 2018, following a suggestion from Doron Zeilberger

nonn

Seiichi Manyama, Table of n, a(n) for n = 0..210
S. Chowla, I. N. Herstein and W. K. Moore, On recursions connected with symmetric groups I, Canad. J. Math. 3 (1951) 328-334.
Dongsu Kim and Jang Soo Kim, A combinatorial approach to the power of 2 in the number of involutions, J. Comb. Theory Ser. A 117 (8) (2010): 1082-1094.

Cf. A000085, A316330, A316331, A316332.

cp's OEIS Frontend

A316330 a(n) = A000085(4*n)/2^n.

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A316331 a(n) = A000085(4*n+1)/2^n.

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Author

Keywords

Links

Crossrefs

A316333 a(n) = A000085(4*n+3)/2^(n+2).

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Author

Keywords

Links

Crossrefs