



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
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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(n1)2.
a(n) = 4*a(n1)3*a(n2).
G.f.: (911*x)/((1x)*(13*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



