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A173131
a(n) = (Cosh[(2n-1)ArcSinh[n]])^2.
9
1, 2, 1445, 19740250, 1361599599377, 298514762397852026, 160545187370375075046277, 179656719395983409634002348450, 373368546362937441101158606899394625
OFFSET
0,2
FORMULA
a(n) ~ 2^(4*n-4) * n^(4*n-2). - Vaclav Kotesovec, Apr 05 2016
MATHEMATICA
Table[Round[Cosh[(2 n - 1) ArcSinh[n]]^2], {n, 0, 10}] (* Artur Jasinski *)
KEYWORD
nonn
AUTHOR
Artur Jasinski, Feb 10 2010
STATUS
approved