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 A131775 #7 Mar 04 2022 01:25:45 %S A131775 1,3,1,1,3,1,3,-1,6,1,1,3,3,6,1,3,-3,12,1,9,1,1,3,3,12,8,9,1,3,-5,18, %T A131775 -5,30,6,12,1,1,3,1,18,15,30,16,12,1,3,-7,24,-19,63,3,60,14,15,1 %N A131775 3*A065941 - 2*A049310. %C A131775 Row sums = A000285, (a Fibonacci-like sequence) starting (1, 4, 5, 9, 14, 23, ...). %F A131775 3*A065941 - 2*A049310. %e A131775 Table begins: %e A131775 1; %e A131775 3, 1; %e A131775 1, 3, 1; %e A131775 3, -1, 6, 1; %e A131775 1, 3, 3, 6, 1; %e A131775 3, -3, 12, 1, 9, 1; %e A131775 1, 3, 3, 12, 8, 9, 1; %e A131775 3, -5, 18, -5, 30, 6, 12, 1; %e A131775 1, 3, 1, 18, 15, 30, 16, 12, 1; %e A131775 ... %Y A131775 Cf. A065941, A049310, A131774, A131776, A131777, A131778. %K A131775 tabl,sign %O A131775 1,2 %A A131775 _Gary W. Adamson_, Jul 14 2007