

A063289


Dimension of the space of weight n cuspidal newforms for Gamma_1( 16 ).


1



1, 2, 7, 11, 16, 20, 25, 29, 34, 38, 43, 47, 52, 56, 61, 65, 70, 74, 79, 83, 88, 92, 97, 101, 106, 110, 115, 119, 124, 128, 133, 137, 142, 146, 151, 155, 160, 164, 169, 173, 178, 182, 187, 191, 196, 200, 205, 209, 214, 218, 223, 227, 232, 236
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OFFSET

2,2


COMMENTS

It appears that for n > 2 a(n) = floor((9n22)/2).  Gary Detlefs, Mar 02 2010


LINKS

Table of n, a(n) for n=2..55.
William A. Stein, Dimensions of the spaces S_k^{new}(Gamma_1(N))
William A. Stein, The modular forms database


FORMULA

Conjecture: a(n) = 9*n/4 + (1)^n/4  45/4 for n >= 3, with first differences in A010710.  R. J. Mathar, Dec 06 2010
Conjectures from M. F. Hasler, Mar 05 2012: (Start)
G.f.: x^2*(1 + 3*x + 6*x^2 + x^3)/(1  x  x^2 + x^3).
a(n+2) = a(n)+9 (n>2), a(2n+1) = a(2n)+4 (n>1), a(2n) = a(2n1)+5 (n>1). (End)


CROSSREFS

Cf. A063232, A063233.
Sequence in context: A174008 A140491 A122823 * A287726 A190518 A190750
Adjacent sequences: A063286 A063287 A063288 * A063290 A063291 A063292


KEYWORD

sign


AUTHOR

N. J. A. Sloane, Jul 14 2001


STATUS

approved



