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 A140705 #5 Aug 27 2023 08:44:04 %S A140705 1,5,1,9,1,1,19,5,1,1,23,5,1,1,1,39,9,5,1,1,1,43,9,5,1,1,1,1,63,19,5, %T A140705 5,1,1,1,1,73,19,9,5,1,1,1,1,1,89,23,9,5,5,1,1,1,1,1,93,23,9,5,5,1,1, %U A140705 1,1,1,1 %N A140705 A000012 * A051731^4. %C A140705 Row sums = A061203: (1, 6, 11, 26, 31, 56,...). %C A140705 Left column = A061202: (1, 5, 9, 19, 23, 39,...). %F A140705 A000012 * A051731^4 as infinite lower triangular matrices, where A051731 = the inverse Mobius transform and A000012 = an infinite lower triangular matrix with all 1's. %e A140705 First few rows of the triangle are: %e A140705 1; %e A140705 5, 1; %e A140705 9, 1, 1; %e A140705 19, 5, 1, 1; %e A140705 23, 5, 1, 1, 1; %e A140705 39, 9, 5, 1, 1, 1; %e A140705 43, 9, 5, 1, 1, 1, 1; %e A140705 63, 19, 5, 5, 1, 1, 1, 1; %e A140705 ... %Y A140705 Cf. A051731, A061203, A061202. %K A140705 nonn,tabl %O A140705 1,2 %A A140705 _Gary W. Adamson_, May 24 2008 %E A140705 a(60) split into 5,1 by _Georg Fischer_, Aug 27 2023