A152224 a(n)=4*a(n-1)+6*a(n-2), n>1 ; a(0)=1, a(1)=6 .

1, 6, 30, 156, 804, 4152, 21432, 110640, 571152, 2948448, 15220704, 78573504, 405618240, 2093913984, 10809365376, 55800945408, 288059973888, 1487045568000, 7676542115328, 39628441869312, 204573020169216, 1056062731892736, 5451689048586240, 28143132585701376

Offset

0,2

Comments

Unsigned version of A152223 .

Links

Harvey P. Dale, Table of n, a(n) for n = 0..1000

Index entries for linear recurrences with constant coefficients, signature (4,6).

Formula

G.F.: (1+2x)/(1-4x-6x^2).

Mathematica

LinearRecurrence[{4, 6}, {1, 6}, 30] (* Harvey P. Dale, Feb 16 2016 *)

Crossrefs

Cf. A152223

Sequence in context: A126474 A127017 A152223 * A238769 A280474 A208790

Adjacent sequences: A152221 A152222 A152223 * A152225 A152226 A152227

Keyword

nonn

Author

Philippe Deléham, Nov 29 2008

Extensions

Corrected and extended by Harvey P. Dale, Feb 16 2016

Status

approved