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 A110321 #8 Sep 04 2024 08:47:19 %S A110321 1,1,1,6,2,1,30,18,3,1,264,120,36,4,1,2520,1320,300,60,5,1,30960, %T A110321 15120,3960,600,90,6,1,428400,216720,52920,9240,1050,126,7,1,6894720, %U A110321 3427200,866880,141120,18480,1680,168,8,1,123742080,62052480,15422400,2600640 %N A110321 A Jacobsthal number related number triangle. %F A110321 T(n,k) = n!*J(n-k+1)/k!, where J(n)=A001045(n). %F A110321 Column k has e.g.f. (x^k/k!)/(1-x-2x^2). %e A110321 Rows begin %e A110321 1; %e A110321 1,1; %e A110321 6,2,1; %e A110321 30,18,3,1; %e A110321 264,120,36,4,1; %e A110321 2520,1320,300,60,5,1; %e A110321 30960,15120,3960,600,90,6,1; %Y A110321 Row sums are A110322. %Y A110321 Antidiagonal sums are A110323. %Y A110321 Inverse is A110324. %K A110321 easy,nonn,tabl %O A110321 0,4 %A A110321 _Paul Barry_, Jul 20 2005