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 A112489 #3 Oct 12 2012 14:40:24 %S A112489 15,315,4900,70532,1008980,14777620,224655816,3568061640,59371808496, %T A112489 1035987707664,18953413075584,363290743698048,7287692926408704, %U A112489 152811506045431296,3344880701417587200,76327884878442508800 %N A112489 Fourth column of triangle A112486 used for e.g.f.s of |Stirling1|=|A008275| diagonals. %F A112489 a(n)= A112486(n, 3), n>=3. a(0)=a(1)=a(2)=0. %F A112489 a(n)= (n+3)*a(n-1) + (n+2)*A112488(n-1), n>=3, a(2):=0. %e A112489 4900 = a(5) = 8*315 + 7*340. %K A112489 nonn,easy %O A112489 3,1 %A A112489 _Wolfdieter Lang_, Sep 12 2005