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 A037258 #10 Jul 08 2025 22:06:01 %S A037258 2,6,11,18,26,36,48,61,75,90,106,123,142,163,185,208,232,257,285,314, %T A037258 344,375,407,440,474,509,546,585,625,666,708,751,795,840,886,933,982, %U A037258 1032,1083,1135,1188,1242,1297,1353,1410,1468,1527,1587,1649,1712,1777 %N A037258 First differences of A037257. %F A037258 a(n) = A037257(n+1) - A037257(n). %Y A037258 Cf. A005228, A030124, A037257. %K A037258 nonn,easy %O A037258 0,1 %A A037258 _N. J. A. Sloane_ %E A037258 More terms from Larry Reeves (larryr(AT)acm.org), Sep 25 2000