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A199111 8*3^n+1. 2
9, 25, 73, 217, 649, 1945, 5833, 17497, 52489, 157465, 472393, 1417177, 4251529, 12754585, 38263753, 114791257, 344373769, 1033121305, 3099363913, 9298091737, 27894275209, 83682825625, 251048476873, 753145430617, 2259436291849, 6778308875545 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..1000

Index to sequences with linear recurrences with constant coefficients, signature (4,-3).

FORMULA

a(n) = 3*a(n-1)-2.

a(n) = 4*a(n-1)-3*a(n-2).

G.f.: (9-11*x)/((1-x)*(1-3*x)).  - Bruno Berselli, Nov 03 2011

a(n) = 1 + 8*A000244(n) = 1 + A005051(n). - Omar E. Pol, Nov 18 2011

PROG

(MAGMA) [8*3^n+1: n in [0..30]];

CROSSREFS

Cf. A000244, A005051, A160173. - Omar E. Pol, Nov 18 2011

Sequence in context: A126363 A036836 A125997 * A196350 A196353 A166103

Adjacent sequences:  A199108 A199109 A199110 * A199112 A199113 A199114

KEYWORD

nonn,easy

AUTHOR

Vincenzo Librandi, Nov 03 2011

STATUS

approved

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Last modified December 20 11:26 EST 2014. Contains 252241 sequences.