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 A127474 #5 Feb 14 2022 21:27:24 %S A127474 1,2,1,3,0,4,4,3,0,4,5,0,0,0,16,6,3,8,0,0,4,7,0,0,0,0,0,36,8,7,0,12,0, %T A127474 0,0,16,9,0,16,0,0,0,0,0,36,10,5,0,0,32,0,0,0,0,16 %N A127474 Triangle, square of A054522. %C A127474 Right border = A127473, squares of phi(n) terms. Row sums = A057660: (1, 3, 7, 11, 21, ...). %F A127474 (A054522)^2 as an infinite lower triangular matrix. %e A127474 First few rows of the triangle: %e A127474 1; %e A127474 2, 1; %e A127474 3, 0, 4; %e A127474 4, 3, 0, 4; %e A127474 5, 0, 0, 0, 16; %e A127474 6, 3, 8, 0, 0, 4; %e A127474 7, 0, 0, 0, 0, 0, 36; %e A127474 8, 7, 0, 12, 0, 0, 0, 16; %e A127474 ... %Y A127474 Cf. A127473, A057660, A054522. %K A127474 nonn,tabl %O A127474 1,2 %A A127474 _Gary W. Adamson_, Jan 15 2007