A026152 a(n) = T(n,n-1), where T is the array in A026148.

1, 4, 10, 29, 81, 230, 652, 1854, 5278, 15048, 42956, 122772, 351300, 1006344, 2885952, 8285001, 23809113, 68490060, 197211394, 568385609, 1639635613, 4734036134, 13679894484, 39562904855, 114507905551, 331674931656, 961408814434

Offset

2,2

Links

Table of n, a(n) for n=2..28.

Formula

Conjecture: -(n+7)*(31*n-87)*a(n) +(164*n^2+313*n-2115)*a(n-1) +(-182*n^2+229*n+891)*a(n-2) +(-164*n^2+59*n+519)*a(n-3) +3*(71*n-104)*(n-3)*a(n-4)=0. - R. J. Mathar, Jun 23 2013

Crossrefs

First differences of A026163.

Sequence in context: A321344 A329156 A052946 * A025179 A116388 A221420

Adjacent sequences: A026149 A026150 A026151 * A026153 A026154 A026155

Keyword

nonn

Author

Clark Kimberling

Status

approved