A094633 A Lucas Jacobsthal product.

2, 1, 9, 20, 77, 231, 774, 2465, 8037, 25916, 84009, 271635, 879382, 2845181, 9208089, 29796580, 96426037, 312037551, 1009780614, 3267709225, 10574544477, 34219920076, 110738027409, 358355719995, 1159663574102, 3752749988581

Offset

0,1

Links

Table of n, a(n) for n=0..25.

Index entries for linear recurrences with constant coefficients, signature (1,7,2,-4).

Formula

G.f. : (2-x-6x^2)/((1-2x-4x^2)(1+x-x^2)); a(n)=L(n)*Jac(n+1)=A000032(n)*A001045(n+1).

Mathematica

LinearRecurrence[{1, 7, 2, -4}, {2, 1, 9, 20}, 30] (* Harvey P. Dale, Sep 25 2020 *)

Crossrefs

Cf. A094632, A093042.

Sequence in context: A083162 A178075 A221756 * A261060 A144244 A079582

Adjacent sequences: A094630 A094631 A094632 * A094634 A094635 A094636

Keyword

easy,nonn

Author

Paul Barry, May 16 2004

Status

approved