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A048496
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a(n) = 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
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OFFSET
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0,2
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COMMENTS
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a(n) = T(2, n), array T given by A048494.
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LINKS
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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 - 3*x + 5*x^2)/((1-x)(1-2*x)^2). (End)
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PROG
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CROSSREFS
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n-th difference of a(n), a(n-1), ..., a(0) is (1, 4, 7, 10, ...).
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KEYWORD
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nonn,easy
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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