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 A195831 #8 Mar 30 2012 17:34:07 %S A195831 0,1,2,3,4,5,6,7,0,8,1,9,2,10,3,0,11,4,1,12,5,2,13,6,3,14,7,4,15,8,5, %T A195831 16,9,6,17,10,7,18,11,8,19,12,9,20,13,10,21,14,11,22,15,12,23,16,13, %U A195831 24,17,14,0,25,18,15,1,26,19,16,2,27,20,17,3,28,21,18,4 %N A195831 Triangle read by rows with T(n,k) = n - A195160(k), n>=1, k>=1, if (n - A195160(k))>=0. %C A195831 Also triangle read by rows in which column k lists the nonnegative integers A001477 starting at the row A195160(k). %C A195831 This sequence is related to the generalized hendecagonal numbers A195160, A195841 and A195851 in the same way as A195310 is related to the generalized pentagonal numbers A001318, A175003 and A000041. See comments in A195825. %e A195831 . 0; %e A195831 . 1; %e A195831 . 2; %e A195831 . 3; %e A195831 . 4; %e A195831 . 5; %e A195831 . 6; %e A195831 . 7, 0; %e A195831 . 8, 1; %e A195831 . 9, 2; %e A195831 . 10, 3, 0; %e A195831 . 11, 4, 1; %e A195831 . 12, 5, 2; %e A195831 . 13, 6, 3; %e A195831 . 14, 7, 4; %e A195831 . 15, 8, 5; %e A195831 . 16, 9, 6; %e A195831 . 17, 10, 7; %e A195831 . 18, 11, 8; %e A195831 . 19, 12, 9; %e A195831 . 20, 13, 10; %Y A195831 Cf. A195160, A195310, A195825, A195826, A195827, A195828, A195829, A195830, A195832, A195833, A195841, A195851. %K A195831 nonn,tabf %O A195831 1,3 %A A195831 _Omar E. Pol_, Sep 24 2011