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 A132808 #14 May 29 2023 08:29:05 %S A132808 1,2,1,5,3,1,14,6,6,1,42,10,20,10,1,132,15,50,50,15,1,429,21,105,175, %T A132808 105,21,1,1430,28,196,490,490,196,28,1,4862,36,336,1176,1764,1176,336, %U A132808 36,1,16796,45,540,2520,5292,5292,2520,540,45,1,58786,55,825,4950,13860,19404,13860,4950,825,55,1 %N A132808 A001263 * A103451 as infinite lower triangular matrices. %C A132808 Replace left border of the Narayana triangle A001263 with the Catalan sequence A000108 starting (1, 2, 5, 14, 42, ...). %C A132808 Row sums = A131428 starting (1, 3, 9, 27, 83, ...). %e A132808 First few rows of the triangle: %e A132808 1; %e A132808 2, 1 %e A132808 5, 3, 1; %e A132808 14, 6, 6, 1; %e A132808 42, 10, 20, 10, 1; %e A132808 132, 15, 50, 50, 15, 1; %e A132808 ... %Y A132808 Cf. A000108, A001263, A103451. %K A132808 nonn,tabl %O A132808 1,2 %A A132808 _Gary W. Adamson_, Aug 31 2007 %E A132808 Definition corrected by _Philippe Deléham_, Oct 11 2007 %E A132808 a(40) split and more terms from _Georg Fischer_, May 29 2023