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A214829 a(n) = a(n-1) + a(n-2) + a(n-3), with a(0) = 1, a(1) = a(2) = 7. 10
1, 7, 7, 15, 29, 51, 95, 175, 321, 591, 1087, 1999, 3677, 6763, 12439, 22879, 42081, 77399, 142359, 261839, 481597, 885795, 1629231, 2996623, 5511649, 10137503, 18645775, 34294927, 63078205, 116018907, 213392039, 392489151, 721900097, 1327781287, 2442170535 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

See comments in A214727.

LINKS

Robert Price, Table of n, a(n) for n = 0..1000

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

FORMULA

G.f.: (x^2-6*x-1)/(x^3+x^2+x-1).

PROG

(PARI) Vec((x^2-6*x-1)/(x^3+x^2+x-1) + O(x^40)) \\ Michel Marcus, Jun 04 2017

CROSSREFS

Cf. A000213, A000288, A000322, A000383, A060455, A136175, A141036, A141523, A214825, A214826, A214827, A214828, A214830, A214831.

Sequence in context: A245426 A168379 A179886 * A168411 A120682 A152910

Adjacent sequences:  A214826 A214827 A214828 * A214830 A214831 A214832

KEYWORD

nonn,easy

AUTHOR

Abel Amene, Aug 07 2012

STATUS

approved

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Last modified February 19 11:04 EST 2018. Contains 299330 sequences. (Running on oeis4.)