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A093460
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a(n) = 2n^(n-1) - 1.
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6
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1, 3, 17, 127, 1249, 15551, 235297, 4194303, 86093441, 1999999999, 51874849201, 1486016741375, 46596170244961, 1587429546508287, 58385852050781249, 2305843009213693951, 97322383751333736961, 4371823119477393063935
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OFFSET
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1,2
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COMMENTS
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a(n) = A111568(n,n-1), i.e., diagonal of A111568. A111568 is the triangle whose n-th row contains n terms of the arithmetic progression having first term 1 and common difference 2*(n^(n-1)-1)/(n-1). - Emeric Deutsch, Aug 08 2005
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LINKS
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Table of n, a(n) for n=1..18.
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MAPLE
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a:=n->2*n^(n-1)-1: seq(a(n), n=1..20); # Emeric Deutsch, Aug 08 2005
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MATHEMATICA
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f[n_] := 2*n^(n-1) - 1; Table[f[i], {i, 1, 30}] (* Ryan Propper, Aug 08 2005 *)
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CROSSREFS
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Cf. A093461, A111568.
Sequence in context: A267736 A129115 A246963 * A187613 A179300 A199493
Adjacent sequences: A093457 A093458 A093459 * A093461 A093462 A093463
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KEYWORD
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nonn
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AUTHOR
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Amarnath Murthy, Apr 05 2004
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EXTENSIONS
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More terms from Emeric Deutsch and Ryan Propper, Aug 08 2005
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STATUS
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approved
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