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A173130
a(n) = Cosh[(2 n - 1) ArcCosh[n]].
9
0, 1, 26, 3363, 937444, 456335045, 343904160606, 371198523608647, 543466014742175624, 1036834190110356583689, 2499384905955651114739810, 7429238104512325157021090411, 26695718139185294187938997247212
OFFSET
0,3
FORMULA
a(n) ~ 2^(2*n-2) * n^(2*n-1). - Vaclav Kotesovec, Apr 05 2016
MATHEMATICA
Table[Round[Cosh[(2 n - 1) ArcCosh[n]]], {n, 0, 20}] (* Artur Jasinski *)
KEYWORD
nonn
AUTHOR
Artur Jasinski, Feb 10 2010
STATUS
approved