A099236 Sums of antidiagonals of A099233.

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

Links

Table of n, a(n) for n=0..28.

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

Adjacent sequences: A099233 A099234 A099235 * A099237 A099238 A099239

Keyword

easy,nonn

Author

Paul Barry, Oct 08 2004

Status

approved