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 A144905 #3 Jan 21 2014 12:30:22 %S A144905 1,2,7,74,1596,58344,3240840,254535840,26862378480,3667537480320, %T A144905 629083000385280,132437508454137600,33575888768939193600, %U A144905 10090248381797704243200,3546915020658948703564800,1441883923593020355819571200,671220876625092844683849216000,354750674999711346878469083136000 %N A144905 a(0) = 1; thereafter a(n) = A105749(n)/n. %p A144905 B := proc(n, k, M) local i; option remember; %p A144905 if n = k then 1; %p A144905 elif k < n then 0; %p A144905 elif n < 1 then 0; %p A144905 else %p A144905 add( binomial(k-1,i)*B(n-1,k-1-i,M),i=0..M-1 ); %p A144905 end if; %p A144905 end proc; %p A144905 p:=proc(n,M) add(B(n,k,M),k=0..M*n); end; %p A144905 l:=proc(n,M) n!*p(n,M); end; %p A144905 [seq(l(n,2)/n,n=1..30)]; %Y A144905 Cf. A001515, A105749, A144906. %K A144905 nonn %O A144905 0,2 %A A144905 _David Applegate_ and _N. J. A. Sloane_, Feb 16 2009