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 A111248 #23 Sep 08 2022 08:45:20 %S A111248 0,1,1,2,1,3,1,3,3,3,2,5,1,4,4,5,2,7,2,6,4,5,3,8,5,5,6,7,3,10,3,8,6,6, %T A111248 6,12,3,7,6,10,4,12,4,9,10,8,5,14,8,13,8,10,5,15,8,12,8,9,6,18,5,10, %U A111248 12,14,8,16,6,12,10,16,7,20,6,11,16,13,10,18,7,18,15,12,8,22,10,13,12,16,8,26 %N A111248 Dimension of the space of weight 2 modular forms for Gamma_0(n). %C A111248 Equivalently, this is the dimension of the space of level n, weight 2 modular forms. - _Steven Finch_, Apr 03 2009 %H A111248 Klaus Brockhaus, <a href="/A111248/b111248.txt">Table of n, a(n) for n = 1..10000</a> %H A111248 S. R. Finch, <a href="/A000521/a000521_1.pdf">Modular forms on SL_2(Z)</a>, December 28, 2005. [Cached copy, with permission of the author] %F A111248 a(n) = A001617(n) + A001616(n) - 1. - _Steven Finch_, Apr 03 2009 %o A111248 (Magma) [ Dimension(ModularForms(Gamma0(n), 2)) : n in [1..100] ]; // Klaus Brockhaus, Mar 10 2011 %Y A111248 Cf. A001616, A001617. [_Steven Finch_, Apr 03 2009] %Y A111248 Cf. A006571. %K A111248 nonn %O A111248 1,4 %A A111248 _Steven Finch_, Oct 31 2005 %E A111248 More terms from _Steven Finch_, Apr 03 2009