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Search: id:A009971
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| 1, 27, 729, 19683, 531441, 14348907, 387420489, 10460353203, 282429536481, 7625597484987, 205891132094649, 5559060566555523, 150094635296999121, 4052555153018976267, 109418989131512359209, 2954312706550833698643
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OFFSET
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0,2
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LINKS
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T. D. Noe, Table of n, a(n) for n=0..100
Tanya Khovanova, Recursive Sequences
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FORMULA
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G.f.: 1/(1-27*x). [From Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Nov 24 2008]
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PROGRAM
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sage: from sage.combinat.sloane_functions import recur_gen2b sage: it =recur_gen2b(1, n/2, n/2, 0, lambda n: 0) sage: [it.next() for i in range(18)] - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jul 16 2008
(Other) sage: [lucas_number1(n, 27, 0) for n in xrange(1, 17)]# [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Apr 29 2009]
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CROSSREFS
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Sequence in context: A016947 A167726 A098838 this_sequence A046240 A042406 A159668
Adjacent sequences: A009968 A009969 A009970 this_sequence A009972 A009973 A009974
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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