A232806 a(n) = a(n-1)^2/2 + 5/2, a(0) = 1.

1, 3, 7, 27, 367, 67347, 2267809207, 2571479299676984427, 3306252894333617140505030630200259167

Offset

0,2

Comments

First differences are 2*A063573.

Links

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

Formula

a(n) = 2*A002065(n) + 1.

a(n) = 2*A166105(n) - 1. - Robert FERREOL, May 31 2020

a(n) = A002065(n) + A166105(n). - Alois P. Heinz, Jun 07 2020

Crossrefs

Cf. A063573, A002065, A166105.

Sequence in context: A267625 A161370 A280020 * A270349 A281701 A101303

Adjacent sequences: A232803 A232804 A232805 * A232807 A232808 A232809

Keyword

nonn

Author

Richard R. Forberg, Nov 30 2013

Status

approved