A122849 Diagonal sums of Bessel related triangle A122848.

1, 0, 1, 1, 1, 3, 4, 6, 16, 25, 46, 120, 211, 441, 1156, 2233, 5104, 13581, 28351, 69345, 188101, 419320, 1082566, 2998776, 7074211, 19099158, 54057004, 133993951, 375814531

Offset: 0

Author

Paul Barry, Sep 14 2006

Keywords

• easy
• nonn

Formula

a(n)=sum{k=0..floor(n/2), k!*C(n-k,k)/((3k-n)!*2^(n-2k))}