OFFSET
0,3
COMMENTS
a(n)=A127768(2n).
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..200
FORMULA
Conjecture: n*(2*n+1)*(2*n-3)*a(n) -2*(4*n-5)*(4*n-3)*(2*n-1)*a(n-1)=0, n>1. - R. J. Mathar, Nov 12 2014
MATHEMATICA
Join[{1}, Table[(3*Binomial[4n-2, 2n])/(2n+1), {n, 20}]] (* Harvey P. Dale, Mar 14 2012 *)
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Paul Barry, Jan 28 2007
STATUS
approved