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A099598 Antidiagonal sums of array A099597. 1
1, 2, 4, 8, 19, 50, 162, 576, 2469, 11218, 59984, 331432, 2120663, 13784290, 102616622, 766648128, 6507054537, 54919451490, 523342287196, 4923469621256, 52040350449307, 539901936037202, 6268123599148282 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..22.

FORMULA

a(n)=sum{k=0..n, C(n,k)*(floor(k/2)!)^2}; a(n)=sum{k=0..n, sum{j=0..n-k, C(n-k,j)C(k,j)j!^2}}; - Paul Barry, May 26 2007

CROSSREFS

Sequence in context: A172383 A003081 A100133 * A269023 A173310 A320178

Adjacent sequences:  A099595 A099596 A099597 * A099599 A099600 A099601

KEYWORD

nonn

AUTHOR

Ralf Stephan, Oct 28 2004

STATUS

approved

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Last modified October 16 21:10 EDT 2019. Contains 328103 sequences. (Running on oeis4.)