A049861 - OEIS

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A049861

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

0, 2, 3, 5, 8, 15, 28, 53, 99, 185, 345, 644, 1202, 2244, 4189, 7820, 14598, 27251, 50871, 94964, 177275, 330930, 617767, 1153223, 2152791, 4018745, 7502034, 14004500, 26143046, 48802803, 91103140, 170067734, 317475711

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,2

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: A307909 A006544 A110536 * A130476 A096592 A305370

Adjacent sequences: A049858 A049859 A049860 * A049862 A049863 A049864

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved