This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A320856 #4 Oct 22 2018 12:03:50 %S A320856 1,1,6,24,81,238,617,1456,3192,6568,12821,23921,42902,74326,124878, %T A320856 204143,325604,507933,776532,1165523,1720164,2499704,3580966,5062537, %U A320856 7069701,9760408,13332198,18030171,24156438,32081010,42254089,55220424,71635678,92284742 %N A320856 Number of 10-element subsets of [n] whose sum is a triangular number. %H A320856 Alois P. Heinz, <a href="/A320856/b320856.txt">Table of n, a(n) for n = 10..1000</a> %Y A320856 Column k=10 of A284249. %Y A320856 Cf. A000217. %K A320856 nonn %O A320856 10,3 %A A320856 _Alois P. Heinz_, Oct 22 2018