A026154 a(n) = T(n,n-3), where T is the array in A026148.

1, 3, 11, 35, 111, 343, 1049, 3177, 9559, 28611, 85293, 253461, 751296, 2222442, 6563598, 19359022, 57038247, 167911721, 493972165, 1452419661, 4268753126, 12542145548, 36841741320, 108202146520, 317748977715, 933052724721, 2739805981773

Offset

3,2

Links

Table of n, a(n) for n=3..29.

Formula

Conjecture: (n+9)*a(n) +(-7*n-47)*a(n-1) +(13*n+51)*a(n-2) +(5*n+37)*a(n-3) +2*(-13*n-6)*a(n-4) +2*(n-13)*a(n-5) +12*(n-4)*a(n-6)=0. - R. J. Mathar, Jun 23 2013

Crossrefs

First differences of A026328.

Sequence in context: A370199 A126940 A026125 * A025181 A004054 A068995

Adjacent sequences: A026151 A026152 A026153 * A026155 A026156 A026157

Keyword

nonn

Author

Clark Kimberling

Status

approved