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 A037259 #10 Jul 08 2025 22:06:08 %S A037259 4,5,7,8,10,12,13,14,15,16,17,19,21,22,23,24,25,28,29,30,31,32,33,34, %T A037259 35,37,39,40,41,42,43,44,45,46,47,49,50,51,52,53,54,55,56,57,58,59,60, %U A037259 62,63,65,66,67,68,69,70,71,72,73,74,76,77,78,79,80,81,82,83,84,85,86 %N A037259 Second differences of A037257. %F A037259 a(n) = A037257(n+2) - 2*A037257(n+1) + A037257(n). %Y A037259 Cf. A005228, A030124, A037257. %K A037259 nonn,easy %O A037259 0,1 %A A037259 _N. J. A. Sloane_ %E A037259 More terms from Larry Reeves (larryr(AT)acm.org), Sep 25 2000