A316331 -id:A316331 - 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.

A316332 a(n) = A000085(4*n+2)/2^(n+1).

Original entry on oeis.org

1, 19, 1187, 149405, 31166057, 9670072483, 4163946939067, 2370770585582221, 1722046856020416785, 1552401874990891104371, 1699257737580930574489619, 2218555640616875773883091901, 3404174268230266459851637679353, 6062646848508401565245592651382915, 12398960005973049406349011215379703723

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, 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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A316332 a(n) = A000085(4*n+2)/2^(n+1).

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

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Author

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