OFFSET
0,3
FORMULA
a(n) = 2^(2*n-A000120(n))*hypergeometric([-n,1/2],[1],1)*hypergeometric([1/2,-n/2,-n/2+1/2],[-n/2+3/4,-n/2+1/4],1/2).
MAPLE
CROSSREFS
KEYWORD
nonn
AUTHOR
Peter Luschny, Feb 24 2016
STATUS
approved