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 A062987 #7 Apr 18 2023 09:48:42 %S A062987 1,31,2529,284191,37071329,5268723231,791682591201,123697944483359, %T A062987 19894672175770081,3271817054307112479,547678880100062177761, %U A062987 93006445178165754746399,15983911852747899752786401 %N A062987 Row sums of unsigned N(5) staircase array A062986. %F A062987 a(n) = N(5; n, -1) with polynomials N(5; n, x) defined in A062986. %F A062987 a(n) = Sum(((-1)^(n-j))*2^(4*j+1)*A002294(j), j=1..n)+(-1)^n, with A002294(j) = A062993(j+3, 3) = binomial(5*j, j)/(4*j+1). %Y A062987 Cf. A002294, A062986, A062993. %K A062987 nonn,easy %O A062987 0,2 %A A062987 _Wolfdieter Lang_, Jul 12 2001