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 A277741 Symmetric array read by antidiagonals: T(n,k) (n >= 1, k >= 1) = number of multiquadrangulations of the sphere with n stable equilibria and k unstable equilibria. 0
 1, 1, 1, 1, 2, 1, 2, 5, 5, 2, 3, 13, 20, 13, 3, 6, 35, 83, 83, 35, 6, 12, 104, 340, 504, 340, 12, 27, 315, 1401, 2843, 2843, 1401, 316, 27, 65, 1021, 5809, 15578, 21420, 15578, 5809, 1021, 65 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,5 LINKS Table of n, a(n) for n=1..44. Richard Kapolnai, Gabor Domokos, and Timea Szabo, Generating spherical multiquadrangulations by restricted vertex splittings and the reducibility of equilibrium classes Periodica Polytechnica Electrical Engineering, 56(1):11-10, 2012. Also arXiv:1206.1698 [cs.DM], 2012. See Table 1. EXAMPLE The array begins: 1, 1, 1, 2, 3, 6, 12, 27, 65, ... 1, 2, 5, 13, 35, 104, 315, 1021, ... 1, 5, 20, 83, 340, 1401, 5809, ... 2, 13, 83, 504, 2843, 15578, ... 3, 35, 340, 2843, 21420, ... 6, 104, 1401, 15578, ... 12, 315, 5809, ... 27, 1021, ... 65, ... ... CROSSREFS Row 2 (equally, column 2) is A006082. Sequence in context: A143913 A228815 A241555 * A241138 A241349 A330405 Adjacent sequences: A277738 A277739 A277740 * A277742 A277743 A277744 KEYWORD nonn,tabl,more AUTHOR N. J. A. Sloane, Nov 07 2016 STATUS approved

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Last modified February 22 22:43 EST 2024. Contains 370265 sequences. (Running on oeis4.)