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A048496
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2^(n-1)*(3*n-4)+3.
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3
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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; refs; listen; history; internal format)
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OFFSET
| 0,2
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COMMENTS
| a(n) = T(2, n), array T given by A048494.
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LINKS
| Vincenzo Librandi, Table of n, a(n) for n = 0..2000
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FORMULA
| a(n) = A027992(n-1)+1 = A053565(n)+3.
a(n) = 5*a(n-1)-8*a(n-2)+4*a(n-3). G.f.: (1-3*x+5*x^2)/((1-x)(1-2*x)^2). - R. J. Mathar, Oct 31 2008
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PROG
| (MAGMA) [2^(n-1)*(3*n-4)+3 : n in [0..30]]; // Vincenzo Librandi, Sep 26 2011
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CROSSREFS
| n-th difference of a(n), a(n-1), ..., a(0) is (1, 4, 7, 10, ...).
Sequence in context: A041159 A034546 A010748 * A037488 A129669 A037568
Adjacent sequences: A048493 A048494 A048495 * A048497 A048498 A048499
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KEYWORD
| nonn,easy
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AUTHOR
| Clark Kimberling (ck6(AT)evansville.edu)
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EXTENSIONS
| Formula from Ralf Stephan, Jan 15 2004
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