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A074569
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4^n + 7^n + 9^n.
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1
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3, 20, 146, 1136, 9218, 76880, 653186, 5622896, 48877058, 428036240, 3770308226, 33362580656, 296287600898, 2638821947600, 23555283963266, 210639767346416, 1886257414388738, 16909829393522960, 151723117614386306
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graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,1
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LINKS
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Vincenzo Librandi, Table of n, a(n) for n = 0..1000
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FORMULA
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G.f.: 1/(1-4*x)+1/(1-7*x)+1/(1-9*x). E.g.f.: exp(4*x)+exp(7*x)+exp(9*x). [From Mohammad K. Azarian, Dec 30 2008]
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MATHEMATICA
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Table[4^n + 7^n + 9^n, {n, 0, 20}]
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PROG
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(MAGMA) [4^n + 7^n + 9^n: n in [0..20]]; // Vincenzo Librandi, Aug 14 2011
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CROSSREFS
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Cf. A001550, A001576, A034513, A001579, A074501 - A074580.
Sequence in context: A009156 A074573 A068571 * A026303 A154627 A091172
Adjacent sequences: A074566 A074567 A074568 * A074570 A074571 A074572
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KEYWORD
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easy,nonn
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AUTHOR
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Robert G. Wilson v, Aug 23 2002
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STATUS
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approved
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