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 A063221 #15 Aug 27 2025 12:09:45
%S A063221 3,10,14,22,26,34,38,46,50,58,62,70,74,82,86,94,98,106,110,118,122,
%T A063221 130,134,142,146,154,158,166,170,178,182,190,194,202,206,214,218,226,
%U A063221 230,238,242,250,254,262,266,274,278,286,290,298
%N A063221 Dimension of the space of weight 2n cuspidal newforms for Gamma_0( 57 ).
%H A063221 William A. Stein, <a href="http://wstein.org/Tables/dimskg0new.gp">Dimensions of the spaces S_k^{new}(Gamma_0(N))</a>
%H A063221 William A. Stein, <a href="http://wstein.org/Tables/">The modular forms database</a>
%H A063221 <a href="/index/Rec#order_03">Index entries for linear recurrences with constant coefficients</a>, signature (1,1,-1).
%F A063221 Seems to be 6n - 3 + A062157(n-1). - _Ralf Stephan_, Feb 16 2004
%F A063221 G.f.: 3x-2*x^2*(-5-2*x+x^2) / ( (1+x)*(x-1)^2 ). - _R. J. Mathar_, Jul 15 2015
%F A063221 a(n) = 2*A007310(n) for n>1. - _Philippe Deléham_, Nov 23 2016
%Y A063221 Cf. A007310.
%Y A063221 Essentially the same as A091999.
%K A063221 nonn,changed
%O A063221 1,1
%A A063221 _N. J. A. Sloane_, Jul 10 2001