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 A361152 #9 Mar 03 2023 09:33:04 %S A361152 0,1,4,9,21,40,79,138,250,415,707,1126,1836,2837,4466,6723,10290, %T A361152 15167,22672,32805,48071,68470,98610,138491,196474,272559,381540, %U A361152 523417,724042,983415,1345848,1811341,2454994,3276807,4402076,5830801,7769950,10219523,13516934 %N A361152 a(n) = (A051894(n) - 1)/2. %Y A361152 Cf. A051894. %K A361152 nonn %O A361152 0,3 %A A361152 _N. J. A. Sloane_, Mar 02 2023