OFFSET
0,2
FORMULA
a(n) = A142459(2*n,n)/(n+1).
MATHEMATICA
A[n_, 1] := 1; A[n_, n_] := 1;
A[n_, k_] := (4*n - 4*k + 1)A[n - 1, k - 1] + (4*k - 3)A[n - 1, k];
a = Table[A[n, k], {n, 20}, {k, n}];
Table[a[[2*n + 1, n + 1]]/(n + 1), {n, 0, 9}]
CROSSREFS
KEYWORD
nonn
AUTHOR
Roger L. Bagula, Nov 19 2010
STATUS
approved