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Search: id:A122025
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| A122025 |
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a(n) = (3*a(n-1)a(n-4)-a(n-2)a(n-3))/a(n-5). |
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+0
1
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| 1, 1, 1, 1, 1, 2, 5, 13, 29, 109, 629, 4274, 23329, 170353, 2034385, 35152177, 494532481, 7768108946, 176258003381, 7248370100941, 266967020984381, 9997125891977197, 431397731193035525, 38079906742644329378
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OFFSET
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1,6
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MATHEMATICA
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a[n_] := a[n] = (3*a[n - 1]a[n - 4] - a[n - 2]*a[n - 3])/a[n - 5]; a[0] = 1; a[1] = 1; a[2] = 1; a[3] = 1; a[4] = 1; Table[a[n], {n, 0, 30}]
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CROSSREFS
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Cf. A006731, A006722.
Sequence in context: A079991 A091270 A045703 this_sequence A057873 A116699 A054127
Adjacent sequences: A122022 A122023 A122024 this_sequence A122026 A122027 A122028
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KEYWORD
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nonn
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AUTHOR
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Roger Bagula (rlbagulatftn(AT)yahoo.com), Sep 13 2006
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EXTENSIONS
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Edited by N. J. A. Sloane (njas(AT)research.att.com), Sep 17 2006
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