A094360 Pair reversal of Jacobsthal-Lucas numbers.

1, 2, 7, 5, 31, 17, 127, 65, 511, 257, 2047, 1025, 8191, 4097, 32767, 16385, 131071, 65537, 524287, 262145, 2097151, 1048577, 8388607, 4194305, 33554431, 16777217, 134217727, 67108865, 536870911, 268435457, 2147483647, 1073741825

Offset

0,2

Comments

Pair reversal of A014551

Links

Table of n, a(n) for n=0..31.

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

Formula

G.f. : (1+3x+5x^2)/((1+x)(1-4x^2)); a(n)=2^n(5+3(-1)^n)/4-(-1)^n.

Mathematica

LinearRecurrence[{-1, 4, 4}, {1, 2, 7}, 40] (* Harvey P. Dale, May 22 2020 *)

Crossrefs

Cf. A084183, A094359.

Sequence in context: A180510 A152555 A343780 * A335594 A051757 A193746

Adjacent sequences: A094357 A094358 A094359 * A094361 A094362 A094363

Keyword

easy,nonn

Author

Paul Barry, Apr 26 2004

Status

approved