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A152224
a(n)=4*a(n-1)+6*a(n-2), n>1 ; a(0)=1, a(1)=6 .
3
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 .
FORMULA
G.F.: (1+2x)/(1-4x-6x^2).
MATHEMATICA
LinearRecurrence[{4, 6}, {1, 6}, 30] (* Harvey P. Dale, Feb 16 2016 *)
CROSSREFS
Sequence in context: A126474 A127017 A152223 * A238769 A280474 A208790
KEYWORD
nonn
AUTHOR
Philippe Deléham, Nov 29 2008
EXTENSIONS
Corrected and extended by Harvey P. Dale, Feb 16 2016
STATUS
approved