A107250 Diagonal sums of number array A107249.

1, 1, 2, 3, 5, 9, 16, 30, 54, 104, 191, 372, 692, 1357, 2550, 5021, 9508, 18773, 35766, 70755, 135461, 268365, 515849, 1023092, 1973159, 3916831, 7575470, 15048428, 29175431, 57990158, 112665488, 224048847, 436089113, 867581269, 1691392152

Offset

0,3

Links

Table of n, a(n) for n=0..34.

Formula

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

Crossrefs

Sequence in context: A298204 A265581 A335703 * A050168 A331966 A072176

Adjacent sequences: A107247 A107248 A107249 * A107251 A107252 A107253

Keyword

easy,nonn

Author

Paul Barry, May 14 2005

Status

approved