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 A275890 #11 Aug 21 2016 11:04:46 %S A275890 1,2,3,3,3,4,5,6,7,7,7,8,8,9,9,10,11,12,13,13,13,14,15,16,17,17,17,18, %T A275890 18,19,19,20,21,21,22,23,24,24,25,25,26,26,26,27,28,29,30,31,31,31,32, %U A275890 33,34,34,35,35,36,36,36,37,38,39,40,40,41,42,42,43,43,44,44,45,46,47,47,48,48,48,49,49 %N A275890 a(n) is the number of i <= n such that A065188(i) >= i. %C A275890 Counts terms of A065188 that are on or below the main diagonal. %Y A275890 Cf. A065188, A275891, A275892. %K A275890 nonn %O A275890 1,2 %A A275890 _N. J. A. Sloane_, Aug 20 2016