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A320854
Number of 8-element subsets of [n] whose sum is a triangular number.
2
1, 1, 5, 17, 48, 122, 276, 573, 1112, 2042, 3578, 6024, 9803, 15476, 23793, 35728, 52522, 75761, 107416, 149923, 206288, 280145, 375868, 498713, 654914, 851807, 1098032, 1403673, 1780402, 2241738, 2803237, 3482687, 4300406, 5279489, 6446078, 7829696, 9463558
OFFSET
8,3
LINKS
CROSSREFS
Column k=8 of A284249.
Cf. A000217.
Sequence in context: A011853 A215053 A213767 * A136303 A268783 A273384
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Oct 22 2018
STATUS
approved