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, 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

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