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 A037261 #9 Jul 08 2025 22:06:14 %S A037261 2,6,17,36,65,106,160,228,311,410,527,664,822,1002,1205,1432,1684, %T A037261 1963,2270,2607,2975,3375,3808,4275,4777,5316,5893,6509,7165,7863, %U A037261 8604,9389,10219,11095,12018,12989,14009,15079,16200,17373,18599,19880,21217 %N A037261 First differences of A037260. %Y A037261 Cf A037262, A037263. %K A037261 nonn,easy %O A037261 0,1 %A A037261 _N. J. A. Sloane_ %E A037261 More terms from Larry Reeves (larryr(AT)acm.org), Sep 25 2000