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 A131774 #7 Mar 04 2022 01:25:42 %S A131774 1,2,1,1,2,1,2,0,4,1,1,2,3,4,1,2,-1,8,2,6,1,1,2,4,8,7,6,1,2,-2,12,0, %T A131774 20,6,8,1,1,2,4,12,15,20,13,8,1,2,-3,16,-6,42,9,40,12,10,1 %N A131774 2*A065941 - A049310. %C A131774 Row sums = the Lucas numbers, A000032, starting (1, 3, 4, 7, 11, ...). Generally, N*A065941 - (N-1)*A049310 = triangles with row sums = Fibonacci-like sequences starting (1, (N+1), (N+1+1), ...). With N = 2, row sums of the triangle A131774 = (1, 3, 4, 7, ...). %F A131774 2*A065941 - A049310 as infinite lower triangular matrices. %e A131774 First few rows of the triangle: %e A131774 1; %e A131774 2, 1; %e A131774 1, 2, 1; %e A131774 2, 0, 4, 1; %e A131774 1, 2, 3, 4, 1; %e A131774 2, -1, 8, 2, 6, 1; %e A131774 1, 2, 4, 8, 7, 6, 1; %e A131774 ... %Y A131774 Cf. A065941, A049310, A000032, A131775, A131776, A131777, A131778. %K A131774 tabl,sign %O A131774 1,2 %A A131774 _Gary W. Adamson_, Jul 14 2007