Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).
%I #23 Sep 08 2022 08:45:20
%S 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 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 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 Dimension of the space of weight 2 modular forms for Gamma_0(n).
%C Equivalently, this is the dimension of the space of level n, weight 2 modular forms. - _Steven Finch_, Apr 03 2009
%H Klaus Brockhaus, <a href="/A111248/b111248.txt">Table of n, a(n) for n = 1..10000</a>
%H 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 a(n) = A001617(n) + A001616(n) - 1. - _Steven Finch_, Apr 03 2009
%o (Magma) [ Dimension(ModularForms(Gamma0(n), 2)) : n in [1..100] ]; // Klaus Brockhaus, Mar 10 2011
%Y Cf. A001616, A001617. [_Steven Finch_, Apr 03 2009]
%Y Cf. A006571.
%K nonn
%O 1,4
%A _Steven Finch_, Oct 31 2005
%E More terms from _Steven Finch_, Apr 03 2009