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Search: id:A108209
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| A108209 |
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a(n) = 5*(n-1)*a(n-1) -2*(n-1)*a(n-2) with a(0)=0, a(1)=2. |
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+0
1
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| 0, 2, 10, 92, 1320, 25664, 628400, 18544032, 640243520, 25313036288, 1127562249600, 55871851754240, 3048145476992000, 181547804177418240, 11721355489130393600, 815411545722159841280, 60804225264488076288000
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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This is also the negative of the (1,2) element of the product matrix after multiplying the unit matrix from the
left by the matrices (0,-2;j-1,5j-5) in the order j=2 to n.
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MATHEMATICA
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M[n_] := {{0, -2}, {(n - 1), 5*(n - 1)}} v[1] = {0, 1} v[n_] := v[n] = M[n].v[n - 1] a = Table[Abs[v[n][[1]]], {n, 1, 25}]
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CROSSREFS
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Cf. A000166.
Sequence in context: A082472 A095937 A108528 this_sequence A111773 A063385 A063393
Adjacent sequences: A108206 A108207 A108208 this_sequence A108210 A108211 A108212
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KEYWORD
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nonn,easy
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AUTHOR
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Roger L. Bagula (rlbagulatftn(AT)yahoo.com), Jun 15 2005
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EXTENSIONS
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Definition replaced by recurrence by the Associate Editors of the OEIS, Sep 28 2009
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