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 A159050 #19 Sep 08 2022 08:45:43 %S A159050 0,1,1,2,3,3,5,5,7,7,10,9,13,12,16,15,20,17,24,22,28,25,33,28,39,33, %T A159050 42,39,49,40,55,48,60,52,72,56,75,63,80,72,90,72,98,85,104,88,115,92, %U A159050 128,103,128,114,143,111,160,132,156,133,174,136,185,150,192,164,216 %N A159050 Dimension of the space of weight 2 modular forms for Gamma_1(n). %C A159050 a(n) = A029937(n) + A029936(n) - 1. %H A159050 Klaus Brockhaus, <a href="/A159050/b159050.txt">Table of n, a(n) for n = 1..1000</a> %H A159050 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] %H A159050 W. A. Stein, <a href="http://wstein.org/books/modform/">Modular Forms: A Computational Approach</a>. %o A159050 (Magma) [ Dimension(ModularForms(Gamma1(n), 2)) : n in [1..100] ]; // _Klaus Brockhaus_, Mar 11 2011 %o A159050 (Sage) def A159050(n): return dimension_modular_forms(Gamma1(n),k=2) # _D. S. McNeil_, Mar 11 2011 %Y A159050 Cf. A029936, A029937, A111248. %K A159050 nonn %O A159050 1,4 %A A159050 _Steven Finch_, Apr 03 2009