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 A141343 #10 Dec 29 2023 10:34:50 %S A141343 1,0,1,0,2,1,0,2,4,1,0,4,8,6,1,0,2,16,18,8,1,0,12,24,44,32,10,1,0,-12, %T A141343 48,90,96,50,12,1,0,72,48,180,240,180,72,14,1,0,-190,160,308,544,530, %U A141343 304,98,16,1,0,700,-40,600,1120,1372,1032,476,128 %N A141343 Riordan array (1,x/sqrt(2-sqrt(1+4x))). %C A141343 Factorizes as (1,xc(-x))*(1,x(1+x)/(1-2x)) where c(x) is the g.f. of A000108. %C A141343 Row sums are A141344. %C A141343 Triangle T(n,k), 0<=k<=n, read by rows, given by [0, 2, -1, -1, -1, -1, -1, -1, -1, ...] DELTA [1, 0, 0, 0, 0, 0, 0, ...] where DELTA is the operator defined in A084938. - _Philippe Deléham_, Nov 15 2008 %e A141343 Triangle begins %e A141343 1, %e A141343 0, 1, %e A141343 0, 2, 1, %e A141343 0, 2, 4, 1, %e A141343 0, 4, 8, 6, 1, %e A141343 0, 2, 16, 18, 8, 1, %e A141343 0, 12, 24, 44, 32, 10, 1, %e A141343 0, -12, 48, 90, 96, 50, 12, 1 %K A141343 easy,sign,tabl %O A141343 0,5 %A A141343 _Paul Barry_, Jun 26 2008