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 A090454 #3 Oct 10 2012 03:12:51 %S A090454 15,105,396,1110,2600,5390,10220,18096,30345,48675,75240,112710, %T A090454 164346,234080,326600,447440,603075,801021,1049940,1359750,1741740, %U A090454 2208690,2774996,3456800,4272125,5241015,6385680,7730646,9302910,11132100 %N A090454 Fourth column (m=5) of array A090452. %F A090454 a(n)= (n+9)*(n+6)*(n+2)*(n+1)*(n^2+15*n+20)/144, %F A090454 G.f.: (15-24*x^2+18*x^3-4*x^4)/(1-x)^7. %Y A090454 Cf. A090453, A091026. %K A090454 nonn,easy %O A090454 0,1 %A A090454 _Wolfdieter Lang_, Dec 23 2003