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A026153 T(n,n-2), where T is the array in A026148. 0
1, 2, 7, 20, 60, 176, 517, 1512, 4415, 12870, 37477, 109044, 317109, 921870, 2679510, 7787904, 22636503, 65804638, 191332945, 556456060, 1618813834, 4710869108, 13713658368, 39935698400, 116340344575, 339050396646, 988474306017 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,2

LINKS

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

FORMULA

Conjecture: -(n+8)*(n-118)*a(n) +(-n^2-561*n-2878)*a(n-1) +2*(38*n^2+203*n-1070)*a(n-2) +2*(-116*n^2+781*n+2493)*a(n-3) +(13*n^2-1012*n+3888)*a(n-4) +3*(107*n-423)*(n-4)*a(n-5)=0. - R. J. Mathar, Jun 23 2013

CROSSREFS

First differences of A026327.

Sequence in context: A007460 A034899 A026124 * A025180 A201967 A116950

Adjacent sequences:  A026150 A026151 A026152 * A026154 A026155 A026156

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified March 28 20:44 EDT 2020. Contains 333103 sequences. (Running on oeis4.)