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 A306735 #17 Mar 08 2019 03:25:02 %S A306735 1,2,1,3,1,1,4,2,3,1,5,3,2,4,1,6,4,3,5,7,1,7,5,4,3,10,11,1,8,6,5,4,7, %T A306735 17,18,1,9,7,6,5,4,18,29,29,1,10,8,7,6,5,9,39,51,47,1,11,9,8,7,6,5,28, %U A306735 73,90,76,1,12,10,9,8,7,6,11,74,127,158,123,1,13,11,10,9,8,7,6,40,164,219,277,199,1 %N A306735 Square array A(n,k), n >= 0, k >= 0, read by antidiagonals, where column k is the expansion of g.f. ((k+1-x)*(1-x)^(k-1))/((1-x)^k-x^(k+1)). %H A306735 Seiichi Manyama, <a href="/A306735/b306735.txt">Antidiagonals n = 0..139, flattened</a> %F A306735 A(n,k) = A306646(k*n,k) for k > 0. %F A306735 A(n,k) = (k+1)*A306680(n,k) - A306680(n-1,k) for n > 0. %e A306735 Square array begins: %e A306735 1, 2, 3, 4, 5, 6, 7, 8, 9, ... %e A306735 1, 1, 2, 3, 4, 5, 6, 7, 8, ... %e A306735 1, 3, 2, 3, 4, 5, 6, 7, 8, ... %e A306735 1, 4, 5, 3, 4, 5, 6, 7, 8, ... %e A306735 1, 7, 10, 7, 4, 5, 6, 7, 8, ... %e A306735 1, 11, 17, 18, 9, 5, 6, 7, 8, ... %e A306735 1, 18, 29, 39, 28, 11, 6, 7, 8, ... %e A306735 1, 29, 51, 73, 74, 40, 13, 7, 8, ... %e A306735 1, 47, 90, 127, 164, 125, 54, 15, 8, ... %Y A306735 Columns 0-2 give A000012, A000032, A259967. %Y A306735 Cf. A306646, A306680. %K A306735 nonn,tabl %O A306735 0,2 %A A306735 _Seiichi Manyama_, Mar 06 2019