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 A063756 #19 Mar 23 2024 11:38:06
%S A063756 1,2,3,5,6,8,9,14,16,18,19,24,25,27,28,42,43,48,49,54,56,58,59,74,76,
%T A063756 78,83,87,88,92,93,144,145,147,148,162,163,165,167,181,182,188,189,
%U A063756 193,195,197,198,250,252,257,258,263,264,279,281,294,296
%N A063756 Number of groups of order <= n.
%H A063756 Andrey Zabolotskiy, <a href="/A063756/b063756.txt">Table of n, a(n) for n = 1..2047</a> [terms a(1)-a(1023) from Eric M. Schmidt]
%t A063756 Table[Sum[FiniteGroupCount[k],{k,1,n}],{n,1,57}] (* _Geoffrey Critzer_, Feb 06 2013 *)
%Y A063756 Partial sums of A000001, which is the main entry for this sequence.
%K A063756 nonn
%O A063756 1,2
%A A063756 _N. J. A. Sloane_, Aug 14 2001