OFFSET
0,2
FORMULA
a(n) = 4^n * Sum_{k>=0} (1/2)^(k+1) * binomial(3*k/2,n).
PROG
(PARI) my(N=30, x='x+O('x^N)); Vec(1/(2-(1+4*x)^(3/2)))
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Seiichi Manyama, Aug 04 2024
STATUS
approved