OFFSET
0,2
LINKS
Nathaniel Johnston, Table of n, a(n) for n = 0..60
FORMULA
E.g.f.: sum(k>=0, a(k) * z^(6*k + 1) / (6*k + 1)! ) = sigma(z, 0, 1/2). - Michael Somos, Jun 10 2011
Row 0 of array in A188797.
MATHEMATICA
a[ n_] := If[ n < 0, 0, With[ {m = 6 n + 1}, m! SeriesCoefficient[ WeierstrassSigma[ x, {0, 1/2}], {x, 0, m}]]]; (* Michael Somos, Jun 10 2011 *)
CROSSREFS
KEYWORD
sign,easy
AUTHOR
N. J. A. Sloane, Apr 10 2011
EXTENSIONS
a(4) - a(13) from Nathaniel Johnston, Apr 11 2011
STATUS
approved