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A328604
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G.f.: (1 + 7*x) / (1 - 2*x - 9*x^2).
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3
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1, 9, 27, 135, 513, 2241, 9099, 38367, 158625, 662553, 2752731, 11468439, 47711457, 198638865, 826680843, 3441111471, 14322350529, 59614704297, 248130563355, 1032793465383, 4298762000961, 17892665190369, 74474188389387, 309982363492095, 1290232422488673, 5370306116406201
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OFFSET
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0,2
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LINKS
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Colin Barker, Table of n, a(n) for n = 0..1000
Index entries for linear recurrences with constant coefficients, signature (2,9).
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FORMULA
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a(n) = 2*a(n-1) + 9*a(n-2) for n>1. - Colin Barker, Oct 21 2019
a(n)/a(n-1) ~ 1 + sqrt(10).
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PROG
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(PARI) Vec((1 + 7*x) / (1 - 2*x - 9*x^2) + O(x^30)) \\ Colin Barker, Dec 13 2019
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CROSSREFS
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Sequence in context: A126322 A020279 A339725 * A230185 A340235 A217640
Adjacent sequences: A328601 A328602 A328603 * A328605 A328606 A328607
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KEYWORD
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nonn,easy
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AUTHOR
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Kyle MacLean Smith, Oct 20 2019
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EXTENSIONS
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Edited by N. J. A. Sloane, Dec 05 2019
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STATUS
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approved
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