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A099236
Sums of antidiagonals of A099233.
1
1, 2, 3, 5, 9, 18, 39, 91, 226, 594, 1643, 4763, 14419, 45444, 148714, 504150, 1766930, 6390720, 23815168, 91306968, 359694457, 1454213026, 6027213531, 25583995337, 111118605583, 493407322280, 2238131105770, 10363617299670, 48954143141361
OFFSET
0,2
FORMULA
a(n)=sum{j=0..n, sum{k=0..n-j, binomial(j(n-j-k), k)}}
CROSSREFS
Sequence in context: A022862 A292541 A097332 * A234535 A320964 A130581
KEYWORD
easy,nonn
AUTHOR
Paul Barry, Oct 08 2004
STATUS
approved