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 A275891 #9 Aug 21 2016 11:04:21 %S A275891 0,0,0,1,2,2,2,2,2,3,4,4,5,5,6,6,6,6,6,7,8,8,8,8,8,9,10,10,11,11,12, %T A275891 12,12,13,13,13,13,14,14,15,15,16,17,17,17,17,17,17,18,19,19,19,19,20, %U A275891 20,21,21,22,23,23,23,23,23,24,24,24,25,25,26,26,27,27,27,27,28,28,29,30,30,31,31,31,31 %N A275891 a(n) is the number of i <= n such that A065188(i) < i. %C A275891 Counts terms of A065188 that are above the main diagonal. %Y A275891 Cf. A065188, A275890, A275892. %K A275891 nonn %O A275891 1,5 %A A275891 _N. J. A. Sloane_, Aug 20 2016