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 A062752 #4 Mar 31 2012 13:20:06 %S A062752 1,15,497,22031,1124849,62379535,3651676657,222085764623, %T A062752 13895337519601,888654458770959,57831897893972465,3817410543738148367, %U A062752 254970980461934291441,17200148833928765494799 %N A062752 Row sums of unsigned N(4) staircase array A062751. %F A062752 a(n)=N(4; n, -1) with the row polynomials N(4; n, x) defined in A062751. %F A062752 a(n)=sum(((-1)^(n-j))*2^(3*j+1)*A002293(j), j=1..n)+(-1)^n, with A002293(j)= A062993(j+2, 2)= binomial(4*j, j)/(3*j+1). %K A062752 nonn,easy %O A062752 0,2 %A A062752 _Wolfdieter Lang_, Jul 12 2001