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%I #4 Oct 22 2018 12:03:50
%S 1,1,6,24,81,238,617,1456,3192,6568,12821,23921,42902,74326,124878,
%T 204143,325604,507933,776532,1165523,1720164,2499704,3580966,5062537,
%U 7069701,9760408,13332198,18030171,24156438,32081010,42254089,55220424,71635678,92284742
%N Number of 10-element subsets of [n] whose sum is a triangular number.
%H Alois P. Heinz, <a href="/A320856/b320856.txt">Table of n, a(n) for n = 10..1000</a>
%Y Column k=10 of A284249.
%Y Cf. A000217.
%K nonn
%O 10,3
%A _Alois P. Heinz_, Oct 22 2018