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A098511
Diagonal sums of a matrix associated to the inverse of a Catalan scaled binomial matrix.
1
1, 1, 3, 6, 21, 54, 186, 479, 1938, 5795, 22888, 70781, 286443, 861463, 3592105, 11492256, 39274353, 148852401, 613876868, 1917516257, 8511689170, 25445125513, 100975365920, 390096404027, 1666653892303, 5319341488465
OFFSET
0,3
COMMENTS
Diagonal sums of A098509.
FORMULA
a(n)=sum{k=0..floor(n/2), denominator((n-k+1)Binomial(n-k, k)/Binomial(2(n-k), n-k))}
CROSSREFS
Sequence in context: A148610 A148611 A148612 * A354734 A112520 A148613
KEYWORD
easy,nonn
AUTHOR
Paul Barry, Sep 11 2004
STATUS
approved