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 A180339 #9 Jan 22 2023 09:16:30 %S A180339 1,2,1,4,1,3,8,2,3,8,16,4,6,8,21,32,8,12,16,21,55,64,16,24,32,42,55, %T A180339 144,128,32,48,64,84,110,144,377,256,64,96,128,168,220,288,377,987 %N A180339 Triangle by rows, A137710 * a diagonalized variant of A001906. %C A180339 Row sums = the even-indexed Fibonacci numbers starting (1, 3, 8, 21, ...). %C A180339 Triangle A137710 has (1, 2, 4, 8, 16, ...) as the left border with all other columns = (1, 1, 2, 4, 8, 16,...). The eigensequence of this triangle = the odd-indexed Fibonacci numbers: (1, 3, 8, 21, 55, ...). %C A180339 Row sums of n-th row = rightmost term of next row. %F A180339 Let triangle A137710 = M as an infinite lower triangular matrix, with Q = a diagonalized variant of A001906 (1, 1, 3, 8, 21, 55,... as the main diagonal and the rest zeros). This triangle = M*Q. %e A180339 First few rows of the triangle: %e A180339 1; %e A180339 2, 1; %e A180339 4, 1, 3; %e A180339 8, 2, 3, 8; %e A180339 16, 4, 6, 8, 21; %e A180339 32, 8, 12, 16, 21, 55; %e A180339 64, 16, 24, 32, 42, 55, 144; %e A180339 128, 32, 48, 64, 84, 110, 144, 377; %e A180339 256, 64, 96, 128, 168, 220, 288, 377, 987; %e A180339 512, 128, 192, 256, 336, 440, 576, 754, 987, 2584; %e A180339 ... %Y A180339 Cf. A137710, A001906. %K A180339 nonn,tabl,more %O A180339 0,2 %A A180339 _Gary W. Adamson_, Aug 28 2010