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A099574 Diagonal sums of triangle A099574. 3
1, 1, 2, 2, 4, 5, 9, 11, 18, 23, 37, 48, 74, 97, 147, 195, 290, 387, 568, 763, 1108, 1495, 2152, 2915, 4167, 5662, 8047, 10962, 15506, 21168, 29825, 40787, 57280, 78448, 109870, 150657, 210521, 288969, 403020, 553677, 770963, 1059932, 1473898 (list; graph; refs; listen; history; internal format)
OFFSET

0,3

FORMULA

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

CROSSREFS

Cf. A099577.

Sequence in context: A051630 A050045 A098386 * A144118 A187069 A089935

Adjacent sequences:  A099571 A099572 A099573 * A099575 A099576 A099577

KEYWORD

easy,nonn

AUTHOR

Paul Barry (pbarry(AT)wit.ie), Oct 23 2004

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Last modified February 16 21:51 EST 2012. Contains 205978 sequences.