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A320853 Number of 7-element subsets of [n] whose sum is a triangular number. 2
1, 1, 5, 14, 36, 84, 174, 337, 613, 1058, 1749, 2787, 4304, 6463, 9476, 13598, 19140, 26486, 36079, 48461, 64263, 84209, 109160, 140100, 178144, 224578, 280871, 348655, 429780, 526341, 640642, 775262, 933082, 1117259, 1331289, 1579031, 1864697, 2192905 (list; graph; refs; listen; history; text; internal format)
OFFSET

7,3

LINKS

Alois P. Heinz, Table of n, a(n) for n = 7..1000

CROSSREFS

Column k=7 of A284249.

Cf. A000217.

Sequence in context: A234097 A211562 A261055 * A193557 A187198 A097507

Adjacent sequences:  A320850 A320851 A320852 * A320854 A320855 A320856

KEYWORD

nonn

AUTHOR

Alois P. Heinz, Oct 22 2018

STATUS

approved

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Last modified September 19 11:06 EDT 2019. Contains 327192 sequences. (Running on oeis4.)