OFFSET
0
COMMENTS
Hankel transform is A186040.
LINKS
G. C. Greubel, Table of n, a(n) for n = 0..1000
MATHEMATICA
Join[{1}, Table[(-1)^(Log[3, GegenbauerC[n, -n, -1/2]/ (Numerator[ GegenbauerC[n, -n, -1/2]/3^n])]), {n, 1, 50}]] (* G. C. Greubel, Mar 06 2017 *)
CROSSREFS
KEYWORD
sign,easy
AUTHOR
Paul Barry, Feb 11 2011
STATUS
approved