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 A127467 #2 Mar 30 2012 17:25:15 %S A127467 1,1,2,2,0,6,2,2,0,8,4,0,0,0,20,2,4,6,0,0,12,6,0,0,0,0,0,42,4,4,0,8,0, %T A127467 0,0,32,6,0,12,0,0,0,0,0,54,4,8,0,0,20,0,0,0,0,40 %N A127467 Mobius transform of A127466. %C A127467 Left column = phi(n), A000010; right border = n*phi(n), A002618; row sums = A007434, (Mobius transform of the squares). %F A127467 Mobius transform of A127466; (A054525 * A127466 as infinite lower triangular matrices). %e A127467 First few rows of the triangle are: %e A127467 1; %e A127467 1, 2; %e A127467 2, 0, 6; %e A127467 2, 2, 0, 8; %e A127467 4, 0, 0, 0, 20; %e A127467 2, 4, 6, 0, 0, 12; %e A127467 6, 0, 0, 0, 0, 0, 42; %e A127467 4, 4, 0, 8, 0, 0, 0, 32; %e A127467 ... %Y A127467 Cf. A127466, A002618, A000010, A054525, A007434. %K A127467 nonn,tabl %O A127467 1,3 %A A127467 _Gary W. Adamson_, Jan 15 2007