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Search: id:A048496
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| 1, 2, 7, 23, 67, 179, 451, 1091, 2563, 5891, 13315, 29699, 65539, 143363, 311299, 671747, 1441795, 3080195, 6553603, 13893635, 29360131, 61865987, 130023427, 272629763, 570425347, 1191182339, 2483027971, 5167382531
(list; graph; listen)
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OFFSET
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0,2
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FORMULA
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a(n)=5*a(n-1)-8*a(n-2)+4*a(n-3). G.f.: (1-3x+5x^2)/((1-x)(1-2x)^2). [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Oct 31 2008]
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CROSSREFS
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a(n)=T(2, n), array T given by A048494.
n-th difference of a(n), a(n-1), ..., a(0) is (1, 4, 7, 10, ...).
a(n) = A027992(n-1)+1 = A053565(n)+3.
Sequence in context: A041159 A034546 A010748 this_sequence A037488 A129669 A037568
Adjacent sequences: A048493 A048494 A048495 this_sequence A048497 A048498 A048499
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KEYWORD
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nonn
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AUTHOR
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Clark Kimberling (ck6(AT)evansville.edu)
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EXTENSIONS
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Formula from Ralf Stephan (ralf(AT)ark.in-berlin.de), Jan 15 2004
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