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A317200 G.f.: -x*(2*x^3+2*x^2+x-2)/(x^4-2*x+1). 1
2, 3, 4, 6, 10, 17, 30, 54, 98, 179, 328, 602, 1106, 2033, 3738, 6874, 12642, 23251, 42764, 78654, 144666, 266081, 489398, 900142, 1655618, 3045155, 5600912, 10301682, 18947746, 34850337, 64099762, 117897842, 216847938, 398845539 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

a(n) = length of A317199(n).

LINKS

Table of n, a(n) for n=1..34.

Bo Tan and Zhi-Ying Wen, Some properties of the Tribonacci sequence, European Journal of Combinatorics, 28 (2007) 1703-1719. See Prop. 2.9.

FORMULA

Bo Tan et al. express a(n) in terms of the tribonacci numbers A000073.

CROSSREFS

Cf. A000073, A317199.

Sequence in context: A060163 A106511 A024490 * A056469 A228863 A004047

Adjacent sequences:  A317197 A317198 A317199 * A317201 A317202 A317203

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Aug 05 2018

STATUS

approved

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Last modified October 21 22:47 EDT 2019. Contains 328315 sequences. (Running on oeis4.)