A192894 - OEIS

A192894

Number of symmetric 13-ary factorizations of the n-cycle (12...n).

1, 1, 7, 13, 112, 247, 2310, 5525, 53998, 135408, 1360289, 3518515, 36017352, 95223414, 988172368, 2655417765, 27844071255, 75769712590, 801012669457, 2201663313200, 23428926096576, 64924369564353, 694644371065372, 1938034271677595, 20829931845958872, 58448142042957576

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OFFSET

1,3

COMMENTS

The six sequences displayed in Table 1 of the Bousquet-Lamathe reference are A047749, A143546, A143547, A143554, A192893, A192894. From this one should be able to guess a g.f.

LINKS

Andrew Howroyd, Table of n, a(n) for n = 1..200

Michel Bousquet and Cédric Lamathe, On symmetric structures of order two, Discrete Math. Theor. Comput. Sci. 10 (2008), 153-176. See Table 1.

CROSSREFS

Sequence in context: A046519 A283920 A128351 * A367597 A241280 A219703

Adjacent sequences: A192891 A192892 A192893 * A192895 A192896 A192897

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Jul 12 2011

EXTENSIONS

a(11) onwards from Andrew Howroyd, Jan 26 2024

STATUS

approved