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 A256158 Triangular array of numbers of 2-polymatroids of rank k on n labeled points, for n>=0, 0<=k<=2n. 3
 1, 1, 1, 1, 1, 3, 6, 3, 1, 1, 7, 29, 41, 29, 7, 1, 1, 15, 135, 477, 784, 477, 135, 15, 1, 1, 31, 642, 5957, 27375, 41695, 27375, 5957, 642, 31, 1, 1, 63, 3199, 87477, 1554077, 7109189, 21937982, 7109189, 1554077, 87477, 3199, 63, 1, 1, 127, 16879, 1604768, 189213842, 3559635761, 733133160992, 86322358307, 733133160992, 3559635761, 189213842, 1604768, 16879, 127, 1 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,6 COMMENTS The rows are symmetric: a(n,k) = a(n,2n-k). Starting with n=7, the rows are not unimodal. LINKS Table of n, a(n) for n=0..63. Thomas J. Savitsky, Enumeration of 2-polymatroids on up to seven elements. SIAM J. Discrete Math., 28(4):1641-1650, 2014. arXiv:1401.8006 EXAMPLE Triangle starts with: n=0: 1 n=1: 1 1 1 n=2: 1 3 6 3 1 n=3: 1 7 29 41 29 7 1 n=4: 1 15 135 477 784 477 135 15 1 n=5: 1 31 642 5957 27375 41695 27375 5957 642 31 1 n=6: 1 63 3199 87477 1554077 7109189 21937982 7109189 1554077 87477 3199 63 1 n=7: 1 127 16879 1604768 189213842 3559635761 733133160992 86322358307 733133160992 3559635761 189213842 1604768 16879 127 1 CROSSREFS Cf. A256156, A256157, A256159, A058669 Sequence in context: A094118 A200478 A340263 * A349237 A123060 A204931 Adjacent sequences: A256155 A256156 A256157 * A256159 A256160 A256161 KEYWORD nonn,tabf AUTHOR Max Alekseyev, Mar 16 2015 STATUS approved

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Last modified March 5 06:19 EST 2024. Contains 370537 sequences. (Running on oeis4.)