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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 (list; graph; refs; listen; history; text; internal format)
OFFSET

6,3

LINKS

Alois P. Heinz, Table of n, a(n) for n = 6..1000

CROSSREFS

Column k=6 of A284249.

Cf. A000217.

Sequence in context: A109414 A027966 A141534 * A192961 A290989 A027660

Adjacent sequences:  A320849 A320850 A320851 * A320853 A320854 A320855

KEYWORD

nonn

AUTHOR

Alois P. Heinz, Oct 22 2018

STATUS

approved

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Last modified February 24 09:40 EST 2020. Contains 332209 sequences. (Running on oeis4.)