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A334159
Irregular triangle read by rows: T(n,k) is the number of colorings of the n-hypercube graph using exactly k unlabeled colors, k = 1..2^n.
9
1, 0, 1, 0, 1, 2, 1, 0, 1, 18, 92, 146, 80, 16, 1, 0, 1, 494, 54583, 1507094, 12630906, 40096740, 58031885, 43419502, 18212138, 4498756, 670366, 60220, 3156, 88, 1, 0, 1, 197546, 5427041958, 17973998149410, 10961517110194516, 1450479305675145412, 56507865332978414188
OFFSET
0,6
LINKS
Andrew Howroyd, Table of n, a(n) for n = 0..62 (rows 0..5)
Eric Weisstein's World of Mathematics, Chromatic Polynomial
Eric Weisstein's World of Mathematics, Hypercube Graph
EXAMPLE
Triangle begins:
0 | 1;
1 | 0, 1;
2 | 0, 1, 2, 1;
3 | 0, 1, 18, 92, 146, 80, 16, 1;
4 | 0, 1, 494, 54583, 1507094, 12630906, 40096740, 58031885, 43419502, 18212138, 4498756, 670366, 60220, 3156, 88, 1;
CROSSREFS
KEYWORD
nonn,tabf
AUTHOR
Andrew Howroyd, Apr 21 2020
STATUS
approved