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A057819 a(0)=4, a(1)=9, a(n) = 4a(n-1) - a(n-2). 0
4, 9, 32, 119, 444, 1657, 6184, 23079, 86132, 321449, 1199664, 4477207, 16709164, 62359449, 232728632, 868555079, 3241491684, 12097411657, 45148154944, 168495208119, 628832677532, 2346835502009, 8758509330504, 32687201820007 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,1
LINKS
Tanya Khovanova, Recursive Sequences
FORMULA
G.f.: (4-7x)/(1-4x+x^2). - Philippe Deléham, Nov 16 2008
MATHEMATICA
Transpose[NestList[{Last[#], 4Last[#]-First[#]}&, {4, 9}, 40]][[1]] (* Harvey P. Dale, Mar 09 2011 *)
CROSSREFS
Sequence in context: A149119 A149120 A219151 * A129196 A119574 A006393
KEYWORD
nonn,easy
AUTHOR
N. J. A. Sloane, Nov 09 2000
STATUS
approved

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Last modified March 28 14:02 EDT 2024. Contains 371254 sequences. (Running on oeis4.)