VOOZH about

URL: https://oeis.org/A165222

⇱ A165222 - OEIS

login
A165222
a(n) = (2^(n+4)+1)*(2^n+1).
0
34, 99, 325, 1161, 4369, 16929, 66625, 264321, 1052929, 4203009, 16794625, 67143681, 268505089, 1073881089, 4295245825, 17180426241, 68720590849, 274880135169, 1099516084225, 4398055424001, 17592203870209, 70368779829249
OFFSET
0,1
FORMULA
From R. J. Mathar, Sep 20 2009: (Start)
a(n) = 7*a(n-1) - 14*a(n-2) + 8*a(n-3).
G.f.: (34-139*x+108*x^2)/((1-x)*(2*x-1)*(4*x-1)). (End)
a(n) = A000051(n) * A000051(n+4). - Michel Marcus, Jul 17 2013
MATHEMATICA
Table[(2^(n+4)+1)(2^n+1), {n, 0, 30}] (* Harvey P. Dale, Mar 18 2022 *)
PROG
(PARI) a(n) = (2^(n+4)+1)*(2^n+1) \\ Michel Marcus, Jul 17 2013
CROSSREFS
Sequence in context: A044602 A159904 A282854 * A173308 A044285 A044666
KEYWORD
nonn,easy
AUTHOR
Boris Hostnik (megpplus(AT)siol.net), Sep 08 2009
EXTENSIONS
Two initial fractional values removed by R. J. Mathar, Sep 20 2009
STATUS
approved