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A320852
Number of 6-element subsets of [n] whose sum is a triangular number.
2
1, 1, 4, 11, 26, 55, 106, 190, 321, 518, 804, 1207, 1763, 2511, 3502, 4794, 6447, 8541, 11163, 14407, 18382, 23215, 29040, 36005, 44284, 54059, 65529, 78918, 94466, 112434, 133104, 156783, 183803, 214518, 249307, 288580, 332774, 382358, 437829, 499717, 568579
OFFSET
6,3
LINKS
CROSSREFS
Column k=6 of A284249.
Cf. A000217.
Sequence in context: A109414 A027966 A141534 * A192961 A290989 A027660
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Oct 22 2018
STATUS
approved