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 A195826 #12 Mar 30 2012 17:34:07 %S A195826 0,1,2,0,3,1,4,2,5,3,0,6,4,1,7,5,2,8,6,3,9,7,4,0,10,8,5,1,11,9,6,2,12, %T A195826 10,7,3,13,11,8,4,14,12,9,5,0,15,13,10,6,1,16,14,11,7,2,17,15,12,8,3, %U A195826 18,16,13,9,4,19,17,14,10,5,20,18,15,11,6,0 %N A195826 Triangle read by rows with T(n,k) = n - A000217(k), n>=1, k>=1, if (n - A000217(k))>=0. %C A195826 Also triangle read by rows in which column k lists the nonnegative integers A001477 starting at the row A000217(k). %C A195826 This sequence is related to the generalized hexagonal numbers (A000217), A195836 and A006950 in the same way as A195310 is related to the generalized pentagonal numbers A001318, A175003 and A000041. See comments in A195825. %e A195826 Written as a triangle: %e A195826 . 0; %e A195826 . 1; %e A195826 . 2, 0; %e A195826 . 3, 1; %e A195826 . 4, 2; %e A195826 . 5, 3, 0; %e A195826 . 6, 4, 1; %e A195826 . 7, 5, 2; %e A195826 . 8, 6, 3; %e A195826 . 9, 7, 4, 0; %e A195826 . 10, 8, 5, 1; %e A195826 . 11, 9, 6, 2; %e A195826 . 12, 10, 7, 3; %e A195826 . 13, 11, 8, 4; %e A195826 . 14, 12, 9, 5, 0; %e A195826 . 15, 13, 10, 6, 1; %e A195826 . 16, 14, 11, 7, 2; %e A195826 . 17, 15, 12, 8, 3; %Y A195826 Cf. A000217, A006950, A195310, A195825, A195827, A195828, A195829, A195830, A195831, A195832, A195833, A195836. %K A195826 nonn,tabf %O A195826 1,3 %A A195826 _Omar E. Pol_, Sep 24 2011