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 A051140 #8 Mar 06 2020 16:00:01 %S A051140 0,0,0,0,1,8,47,259,1437,8208,48659,300553,1937958,13052028,91784452, %T A051140 673328720,5146726651,40934788112,338292605257,2900716040495, %U A051140 25769979503573,236876549095324,2249873611378525,22053647698650293,222832106687369092 %N A051140 a(n) = (A000110(n) - A000994(n+2))/2. %e A051140 a(7) = (877 - 359)/2 = 259. %Y A051140 Cf. A000110, A000994. %K A051140 nonn %O A051140 0,6 %A A051140 _N. J. A. Sloane_