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 A116669 #2 Mar 30 2012 17:25:12 %S A116669 1,1,1,1,4,1,1,4,7,1,1,4,12,10,1,1,4,12,25,13,1,1,4,12,32,43,16,1,1,4, %T A116669 12,32,71,66,19,1,1,4,12,32,80,136,94,22,1 %N A116669 Triangle, rows tend to A001787, number of edges in n-dimensional hypercubes. %C A116669 Rows tend to A001787: 1, 4, 12, 32, 80, 192, 448...(number of edges in n-dimensional hypercubes). First difference terms of the triangle columns become rows of the triangle A116666. %F A116669 Construct an array formed by taking binomial transforms of (1,0,0,0...); (1,3,0,0,0...); (1,3,5,0,0,0). Antidiagonals of the array become rows of the triangle. %e A116669 First few rows of the array are: %e A116669 1 1 1 1 1... %e A116669 1 4 7 10 13... %e A116669 1 4 12 25 43... %e A116669 1 4 12 32 71... %e A116669 ... %e A116669 By taking antidiagonals, first few rows of the triangle are: %e A116669 1; %e A116669 1, 1; %e A116669 1, 4, 1; %e A116669 1, 4, 7, 1; %e A116669 1, 4, 12, 10, 1; %e A116669 1, 4, 12, 25, 13, 1; %e A116669 ... %Y A116669 Cf. A001787, A116666, A116668. %K A116669 nonn,tabl %O A116669 1,5 %A A116669 _Gary W. Adamson_, Feb 22 2006