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A173131 a(n) = (Cosh[(2n-1)ArcSinh[n]])^2. 9
1, 2, 1445, 19740250, 1361599599377, 298514762397852026, 160545187370375075046277, 179656719395983409634002348450, 373368546362937441101158606899394625 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..8.

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 *)

CROSSREFS

Cf. A058331, A001079, A037270, A071253, A108741, A132592, A146311, A146312, A146313, A173115, A173116, A173121, A173127, A173128, A173129, A173130.

Sequence in context: A227247 A294321 A272168 * A160087 A170993 A259323

Adjacent sequences:  A173128 A173129 A173130 * A173132 A173133 A173134

KEYWORD

nonn

AUTHOR

Artur Jasinski, Feb 10 2010

STATUS

approved

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Last modified November 13 04:20 EST 2019. Contains 329085 sequences. (Running on oeis4.)