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 A226920 Array read by antidiagonals: T(n,k) = number of completely symmetric polynomials of degree k up to momentum conservation for n particles (n >= 4, k >= 0). 1
 1, 1, 0, 1, 0, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 1, 0, 1, 2, 2, 1, 1, 0, 1, 2, 4, 2, 2, 1, 0, 1, 2, 4, 6, 5, 1, 1, 0, 1, 2, 5, 8, 13, 4, 2, 1, 0, 1, 2, 5, 10, 20, 19, 8, 2, 1, 0, 1, 2, 5, 10, 28, 36, 36, 9, 2 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 4,19 LINKS Table of n, a(n) for n=4..69. R. H. Boels, On the field theory expansion of superstring five point amplitudes, arXiv preprint arXiv:1304.7918, 2013 EXAMPLE Array begins: 1,0,1,1,1,1,2,1,2,2,2,2,3,2,3,... 1,0,1,1,2,2,5,4,8,9,13,15,23,24,34,... 1,0,1,2,4,6,13,19,36,58,97,149,244,364,558,... 1,0,1,2,4,8,20,36,83,169,344,680,1342,2518,4695,... 1,0,1,2,5,10,28,59,152,364,885,2093,4930,11199,25021,... 1,0,1,2,5,10,31,72,205,557,1565,4321,11942,32131,84927,... 1,0,1,2,5,11,33,81,246,722,2222,6875,21497,66299,202179,... ... CROSSREFS Columns converge to A226919. Sequence in context: A327747 A282750 A265890 * A362759 A123736 A358476 Adjacent sequences: A226917 A226918 A226919 * A226921 A226922 A226923 KEYWORD nonn,tabl,more AUTHOR N. J. A. Sloane, Jul 12 2013 STATUS approved

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Last modified May 29 00:29 EDT 2024. Contains 372921 sequences. (Running on oeis4.)