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Search: id:A144465
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| A144465 |
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Sequence of powers: a(n)=If [n == 0, 1, 5^n - 2^(n - 1)]. |
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+0
1
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| 1, 4, 23, 121, 617, 3109, 15593, 78061, 390497, 1952869, 9765113, 48827101, 244138577, 1220699029, 6103507433, 30517561741, 152587857857, 762939387589, 3814697134553, 19073486065981, 9536743111633
(list; graph; listen)
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OFFSET
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1,2
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FORMULA
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a(n)=If [n == 0, 1, 5^n - 2^(n - 1)].
a(n)= 7*a(n-1)-10*a(n-2), n>3. G.f.: x(1-3x+5x^2)/((1-5x)(1-3x)). [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Dec 08 2008]
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MATHEMATICA
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Table[If [n == 0, 1, 5^n - 2^(n - 1)], {n, 0, 20}]
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CROSSREFS
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Sequence in context: A017973 A124507 A015532 this_sequence A024050 A038723 A091640
Adjacent sequences: A144462 A144463 A144464 this_sequence A144466 A144467 A144468
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KEYWORD
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nonn,uned
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AUTHOR
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Roger L. Bagula (rlbagulatftn(AT)yahoo.com), Oct 09 2008
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