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 A037130 #9 Jul 08 2025 22:02:18 %S A037130 0,2,12,56,240,994,4032,16280,65280,261626,1047552,4192266,16773160, %T A037130 67100670,268419048,1073709056,4294901774,17179738108,68719214620, %U A037130 274877382642,1099510579208,4398044413950,17592181850104,70368735789062,281474959933418,1125899873288212 %N A037130 Nextprime(4^n)-nextprime(2^n). %K A037130 nonn %O A037130 0,2 %A A037130 _N. J. A. Sloane_ %E A037130 More terms from _Sean A. Irvine_, Dec 09 2020