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 A131245 #12 Feb 28 2022 12:09:58 %S A131245 1,2,1,3,2,1,5,5,2,1,8,9,7,2,1,13,19,13,9,2,1,21,33,34,17,11,2,1,34, %T A131245 65,61,53,21,13,2,1,55,111,141,97,76,25,15,2,1,89,210,248,257,141,103, %U A131245 29,17,2,1,144,355,534,461,421,193,134,33,19,2,1 %N A131245 A046854^2 as an infinite lower triangular matrix. %C A131245 Left border = Fibonacci numbers. %C A131245 Row sums = A131246. %C A131245 A131243 is the square of the reflection triangle to A046854: A065941. %C A131245 Row sums of A131243 = (1, 3, 6, 14, 30, 67, 146, 322, 705, 1549, ...). %e A131245 First few rows of the triangle: %e A131245 1; %e A131245 2, 1; %e A131245 3, 2, 1; %e A131245 5, 5, 2, 1; %e A131245 8, 9, 7, 2, 1; %e A131245 13, 19, 13, 9, 2, 1; %e A131245 21, 33, 34, 17, 11, 2, 1; %e A131245 ... %o A131245 (PARI) T(n, k) = binomial((n+k)\2, k); %o A131245 row(n) = my(m=matrix(n+1, n+1, i, j, T(i-1,j-1))); vector(n+1, i, (m^2)[n+1,i]); %o A131245 lista(nn) = for (n=0, nn, my(v=row(n)); for (i=1, #v, print1(v[i], ", "));); \\ _Michel Marcus_, Feb 28 2022 %Y A131245 Cf. A131243, A131244, A131246, A046854, A065941. %K A131245 nonn,tabl %O A131245 0,2 %A A131245 _Gary W. Adamson_, Jun 22 2007 %E A131245 More terms from _Michel Marcus_, Feb 28 2022