OFFSET
0,3
FORMULA
a(n) = T(2n,n), where T(n,k) = A096815(n,k).
MATHEMATICA
T[n_, k_] := T[n, k] = If[n < k || k < 0, 0, If[k = 1 || k == n, 1, Sum[T[n-k, j]T[k, k-j], {j, 0, k}]]]
Table[T[2n, n], {n, 0, 50}]
CROSSREFS
KEYWORD
nonn
AUTHOR
Emanuele Munarini, May 16 2012
STATUS
approved