A107250 - OEIS

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A107250

Diagonal sums of number array A107249.

0

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

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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