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Search: id:A025579
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| A025579 |
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a(1)=1, a(2)=2, a(n) = 4*3^(n-3) for n >= 3. |
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+0
3
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| 1, 2, 4, 12, 36, 108, 324, 972, 2916, 8748, 26244, 78732, 236196, 708588, 2125764, 6377292, 19131876, 57395628, 172186884, 516560652, 1549681956, 4649045868, 13947137604, 41841412812, 125524238436, 376572715308, 1129718145924
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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a(n) = sum of the numbers in row n+1 of the array defined in A025564 (and of the array in A024996).
a(n) = number of (s(0), s(1), ..., s(n)) such that every s(i) is an integer, s(0) = 0, |s(i) - s(i-1)| = 1 for i = 1,2; |s(i) - s(i-1)| <= 1 for i >= 3.
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FORMULA
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a(n)=A003946(n-2), n>2. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), May 28 2008
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CROSSREFS
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Sequence in context: A112083 A089965 A084716 this_sequence A010552 A054542 A117757
Adjacent sequences: A025576 A025577 A025578 this_sequence A025580 A025581 A025582
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KEYWORD
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nonn,nice
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AUTHOR
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Clark Kimberling (ck6(AT)evansville.edu)
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EXTENSIONS
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Definition corrected by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), May 28 2008
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