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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 * A123736 A185304 A081389

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 26 17:40 EDT 2020. Contains 334630 sequences. (Running on oeis4.)