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A137495 A098601(2n)+A098601(2n+1) 0
2, 3, 4, 7, 13, 23, 40, 70, 123, 216, 379, 665, 1167, 2048, 3594, 6307, 11068, 19423, 34085, 59815, 104968, 184206, 323259, 567280, 995507, 1746993, 3065759, 5380032, 9441298, 16568323, 29075380, 51023735, 89540413, 157132471, 275748264, 483904470, 849193147, 1490230088 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Table of n, a(n) for n=0..37.

Index entries for linear recurrences with constant coefficients, signature (2,-1,1)

FORMULA

a(3n) = A135364(2n+1). a(3n+1) = A137584(2n+1). a(3n+2) = A137531(2n+2).

G.f. ( -2+x ) / ( -1+2*x-x^2+x^3 ). a(n) = 2*A005314(n+1)-A005314(n). - R. J. Mathar, Jul 06 2011

PROG

(PARI) Vec((x-2)/(-1+2*x-x^2+x^3)+O(x^99)) \\ Charles R Greathouse IV, Jul 06 2011

CROSSREFS

Cf. A005314.

Sequence in context: A031149 A096723 A266498 * A099779 A270440 A000690

Adjacent sequences:  A137492 A137493 A137494 * A137496 A137497 A137498

KEYWORD

nonn,easy

AUTHOR

Paul Curtz, Apr 27 2008

STATUS

approved

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Last modified June 4 08:18 EDT 2020. Contains 334825 sequences. (Running on oeis4.)