A052208 a(n) = Pell(n)*Pell(2*n)/2.

0, 1, 12, 175, 2448, 34481, 485100, 6826079, 96049728, 1351523425, 19017374892, 267594778639, 3765344259600, 52982414452241, 745519146496332, 10490250465629375, 147609025664755968, 2077016609773544641, 29225841562491165900, 411238798484657629039

Offset

0,3

Links

Table of n, a(n) for n=0..19.

Formula

G.f.: (x^3+x)/((1+2x-x^2)*(1-14x-x^2)).

Mathematica

CoefficientList[Series[(x^3+x)/((1+2x-x^2)(1-14x-x^2)), {x, 0, 30}], x] (* Harvey P. Dale, Dec 20 2018 *)

Crossrefs

Cf. A000129.

Sequence in context: A230815 A099930 A307549 * A234531 A045952 A227714

Adjacent sequences: A052205 A052206 A052207 * A052209 A052210 A052211

Keyword

nonn

Author

Gary W. Adamson, Feb 01 2000

Status

approved