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 A249050 #7 May 09 2021 02:30:56 %S A249050 0,0,0,0,1,2,1,2,3,6,7,10,9,14,13,14,19,22,23,26,31,36,37,42,45,46,45, %T A249050 44,49,52,51,50,55,62,65,66,69,70,73,80,85,88,93,94,103,104,109,114, %U A249050 117,118,121,126,127,136,135,136,135,138,139,150,161,164,163,164 %N A249050 a(n) = number of integers 2 <= i < A247665(n) that are not yet terms of A247665. %C A249050 An alternative version to A249049. The latter is the main entry. %Y A249050 Cf. A247665. Equals A249049(n)-1. %K A249050 nonn %O A249050 1,6 %A A249050 _N. J. A. Sloane_, Oct 30 2014