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 A318595 #4 Aug 29 2018 16:53:45
%S A318595 1,1,13,190,2925,46376,749398,12271518,202927725,3381098545,
%T A318595 56672074888,954526728530,16141841823510,273897571557780,
%U A318595 4660989191504198,79515468511191440,1359472297966470765,23287391568864135063,399584727647019644125,6866816177157320098000
%N A318595 Number of n-member subsets of [7*n] whose elements sum to a multiple of seven.
%H A318595 Alois P. Heinz, <a href="/A318595/b318595.txt">Table of n, a(n) for n = 0..804</a>
%e A318595 a(2) = 13: {1,6}, {1,13}, {2,5}, {2,12}, {3,4}, {3,11}, {4,10}, {5,9}, {6,8}, {7,14}, {8,13}, {9,12}, {10,11}.
%Y A318595 Column k=7 of A318557.
%K A318595 nonn
%O A318595 0,3
%A A318595 _Alois P. Heinz_, Aug 29 2018