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 A147293 #6 Dec 11 2019 09:48:56 %S A147293 1,1,2,2,2,5,4,4,5,13,8,8,10,13,34,16,16,20,26,34,89,32,32,40,52,68, %T A147293 89,233,64,64,80,104,136,178,233,610,128,128,160,208,272,356,466,610, %U A147293 1597,256,256,320,416,544,712,932,1220,1597,4181 %N A147293 Triangle read by rows, A011782 convolved with A001519. %C A147293 Row sums = A061667: (1, 3, 9, 26, 73, 201, ...). %F A147293 Let M = an infinite lower triangular matrix with A011782: (1, 1, 2, 4, 8, 16, ...) in every column; and Q = an infinite lower triangular matrix with odd-indexed Fibonacci numbers, A001519: (1, 2, 5, 13, 34, 89, ...) as the main column and the rest zeros. %F A147293 A147293 = M * Q. %e A147293 First few rows of the triangle = %e A147293 1; %e A147293 1, 2; %e A147293 2, 2, 5; %e A147293 4, 4, 5, 13; %e A147293 8, 8, 10, 13, 34; %e A147293 16, 16, 20, 26, 34, 89; %e A147293 32, 32, 40, 52, 68, 89, 233; %e A147293 64, 64, 80, 104, 136, 178, 233, 610; %e A147293 128, 128, 160, 208, 272, 356, 466, 610, 1597; %e A147293 256, 256, 320, 416, 544, 712, 932, 1220, 1597, 4181; %e A147293 ... %e A147293 Row 3 = (4, 4, 5, 13) = termwise products of (4, 2, 1, 1) and (1, 2, 5, 13). Row 3 sum of terms = 26 = (1, 1, 2, 4) convolved with (1, 2, 5, 13). %Y A147293 Cf. A001519, A011782, A061667. %K A147293 nonn,tabl %O A147293 0,3 %A A147293 _Gary W. Adamson_, Nov 05 2008