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Search: id:A140824
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| A140824 |
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G.f.: (x-x^3)/(1-3*x+2*x^2-3*x^3+x^4). |
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+0
1
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| 0, 1, 3, 6, 15, 41, 108, 281, 735, 1926, 5043, 13201, 34560, 90481, 236883, 620166, 1623615, 4250681, 11128428, 29134601, 76275375, 199691526, 522799203, 1368706081, 3583319040, 9381251041, 24560434083, 64300051206, 168339719535, 440719107401, 1153817602668
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OFFSET
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0,3
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COMMENT
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A divisibilty sequence.
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FORMULA
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a(0) = 0, a(1) = 1, a(2) = 3, a(3) = 6, a(n) - 3 a(n + 1) + 2 a(n + 2) - 3 a(n + 3) + a(n + 4) = 0.
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CROSSREFS
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Sequence in context: A086326 A098701 A152799 this_sequence A001433 A005368 A067771
Adjacent sequences: A140821 A140822 A140823 this_sequence A140825 A140826 A140827
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com), Sep 07 2009, based on email from R. K. Guy, Mar 09 2009
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