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 A125802 #5 Jun 14 2017 00:16:16 %S A125802 1,5,35,485,15200,1144664,215155493,103674882878,130648799730635, %T A125802 437302448840089232,3936208033244539574405,96244898501021613327012635, %U A125802 6446494058446469307795159512465,1191218783863555524342034469450207222 %N A125802 Column 4 of table A125800; also equals row sums of matrix power A078122^4. %C A125802 Triangle A078122 shifts left one column under matrix cube and is related to partitions into powers of 3. %o A125802 (PARI) a(n)=local(p=4,q=3,A=Mat(1), B); for(m=1, n+1, B=matrix(m, m); for(i=1, m, for(j=1, i, if(j==i || j==1, B[i, j]=1, B[i, j]=(A^q)[i-1, j-1]); )); A=B); return(sum(c=0,n,(A^p)[n+1,c+1])) %Y A125802 Cf. A125800, A078122; other columns: A078125, A078124, A125801, A125803. %K A125802 nonn %O A125802 0,2 %A A125802 _Paul D. Hanna_, Dec 10 2006