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 A027088 #12 Jun 24 2020 14:05:23 %S A027088 1,3,6,16,41,107,283,757,2043,5557,15216,41906,115999,322537,900406, %T A027088 2522616,7090307,19987069,56492426,160062636,454529595,1293394325, %U A027088 3687475479,10531663241,30128741717,86324342567,247691217352 %N A027088 a(n) = A027082(n, 2n-1). %F A027088 Conjecture: D-finite with recurrence 3*(n+1)*(18*n-85)*a(n) +(292*n^2-1316*n-255)*a(n-1) +(-218*n^2+1213*n-1056)*a(n-2) +2*(-248*n^2+1666*n-2223)*a(n-3) +(-50*n^2-497*n+3243)*a(n-4) +(-52*n^2+80*n+765)*a(n-5) +3*(22*n-83)*(n-6)*a(n-6)=0. - _R. J. Mathar_, Jun 24 2020 %Y A027088 Cf. A027082. %K A027088 nonn %O A027088 1,2 %A A027088 _Clark Kimberling_