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A108630 G.f.: (1+x-sqrt(1-2*x-7*x^2-8*x^3-4*x^4))/(2+2*x+2*x^2). 1
1, 1, 2, 6, 17, 54, 178, 606, 2116, 7533, 27242, 99799, 369583, 1381309, 5203599, 19737935, 75321337, 288968031, 1113893815, 4312073256, 16756934181, 65345024968, 255625711296, 1002888257745, 3945055462020, 15556613282788 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..26.

FORMULA

Conjecture D-finite with recurrence: (-n+1)*a(n) +(n-4)*a(n-1) +8*(n-4)*a(n-2) +(17*n-77)*a(n-3) +(19*n-100)*a(n-4) +12*(n-6)*a(n-5) +4*(n-7)*a(n-6)=0. - R. J. Mathar, Sep 27 2014

CROSSREFS

Cf. A039985.

Sequence in context: A307975 A148453 A097514 * A161408 A150033 A150034

Adjacent sequences:  A108627 A108628 A108629 * A108631 A108632 A108633

KEYWORD

nonn

AUTHOR

Christian G. Bower, Jun 12 2005

STATUS

approved

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Last modified May 31 13:01 EDT 2020. Contains 334748 sequences. (Running on oeis4.)