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A099561 Sum C(n-3k,k-1), k=0..floor(n/4). 2
0, 0, 0, 0, 1, 1, 1, 1, 3, 4, 5, 6, 10, 14, 19, 25, 36, 50, 69, 94, 131, 181, 250, 344, 476, 657, 907, 1251, 1728, 2385, 3292, 4543, 6272, 8657, 11949, 16492, 22765, 31422, 43371, 59863, 82629, 114051, 157422, 217285, 299915, 413966, 571388, 788673 (list; graph; refs; listen; history; internal format)
OFFSET

0,9

FORMULA

G.f.: x^4/((1-x^4)(1-x-x^4)); a(n)=a(n-1)+2a(n-4)-a(n-5)-a(n-8).

CROSSREFS

Cf. A074331, A099560, A099562.

Sequence in context: A174057 A164977 A103033 * A110300 A143713 A089912

Adjacent sequences:  A099558 A099559 A099560 * A099562 A099563 A099564

KEYWORD

easy,nonn

AUTHOR

Paul Barry (pbarry(AT)wit.ie), Oct 22 2004

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Last modified February 15 21:27 EST 2012. Contains 205859 sequences.