OFFSET
0,2
LINKS
Harvey P. Dale, Table of n, a(n) for n = 0..560
FORMULA
a(n) = A014228(n)/2.
MAPLE
a:= proc(n) option remember; `if`(n=0, 1,
8*(2*n-1)*(2*n+1)*(2*n+3)*a(n-1)/((n+1)*(n+2)*(n+3)))
end:
seq(a(n), n=0..20); # Alois P. Heinz, Oct 20 2013
MATHEMATICA
Times@@@Partition[CatalanNumber[Range[0, 20]], 3, 1]/2 (* Harvey P. Dale, Apr 10 2013 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
STATUS
approved