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 A131778 #7 Mar 04 2022 01:26:14 %S A131778 1,6,1,1,6,1,6,-4,12,1,1,6,3,12,1,6,-9,24,-2,18,1,1,6,0,24,11,18,1,6, %T A131778 -14,36,-20,60,6,24,1,1,6,-8,36,15,60,25,24,1,6,-19,48,-58,126,-15, %U A131778 120,20,30,1 %N A131778 6*A065941 - 5*A049310. %C A131778 Row sums = A022097, a Fibonacci-like sequence starting (1, 7, 8, 15, 23, 38, ...). %F A131778 6*A065941 - 5*A049310 as infinite lower triangular matrices. %e A131778 First few rows of the triangle: %e A131778 1; %e A131778 6, 1; %e A131778 1, 6, 1; %e A131778 6, -4, 12, 1; %e A131778 1, 6, 3, 12, 1; %e A131778 6, -9, 24, -2, 18, 1; %e A131778 1, 6, 0, 24, 11, 18, 1; %e A131778 ... %Y A131778 Cf. A065941, A049310, A099097, A131774, A131775, A131776, A131777. %K A131778 tabl,sign %O A131778 1,2 %A A131778 _Gary W. Adamson_, Jul 14 2007