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 A161337 #6 Jul 31 2021 01:59:39 %S A161337 0,2,4,6,12,14,20,26,32,42,48,58,72,74,80,86,96,114,124,150,164,182, %T A161337 208,222,244,270,276,290,304,322,352,374,416,446,476,510,532,558,588, %U A161337 618,648,666,688,726,752,794,836,870,904,950,984,1038,1072,1110,1164,1206 %N A161337 a(n) = (A161330(n+1) - 2)/3. %Y A161337 Cf. A161330, A161331, A161336, A161338. %K A161337 nonn %O A161337 0,2 %A A161337 _Omar E. Pol_, Jun 09 2009 %E A161337 More terms from _Jinyuan Wang_, Jul 30 2021