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 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Artur Jasinski, Feb 10 2010
STATUS
approved