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A049875 a(n)=Sum{a(k): k=0,1,2,...,n-4,n-2,n-1}; a(n-3) is not a summand; 3 initial terms required. 0
2, 3, 3, 6, 11, 22, 41, 77, 143, 267, 498, 930, 1736, 3241, 6050, 11294, 21083, 39357, 73470, 137151, 256028, 477943, 892205, 1665533, 3109151, 5804040, 10834752, 20225886, 37756883, 70483054, 131574974, 245618951, 458511731 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Table of n, a(n) for n=0..32.

FORMULA

a(n)=2*a(n-1)-a(n-3)+a(n-4); 4 initial terms required.

CROSSREFS

Sequence in context: A059191 A124063 A054630 * A180887 A173094 A087989

Adjacent sequences:  A049872 A049873 A049874 * A049876 A049877 A049878

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified October 21 16:25 EDT 2019. Contains 328302 sequences. (Running on oeis4.)