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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
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0, 2, 10, 92, 1320, 25664, 628400, 18544032, 640243520, 25313036288, 1127562249600, 55871851754240, 3048145476992000, 181547804177418240, 11721355489130393600, 815411545722159841280, 60804225264488076288000
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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COMMENTS
| 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
| 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
| Cf. A000166.
Sequence in context: A108528 A181136 A182952 * A111773 A195415 A181084
Adjacent sequences: A108206 A108207 A108208 * A108210 A108211 A108212
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KEYWORD
| nonn,easy
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AUTHOR
| Roger L. Bagula (rlbagulatftn(AT)yahoo.com), Jun 15 2005
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EXTENSIONS
| Definition replaced by recurrence by the Associate Editors of the OEIS, Sep 28 2009
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