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A199566 (7*9^n+1)/2. 1
4, 32, 284, 2552, 22964, 206672, 1860044, 16740392, 150663524, 1355971712, 12203745404, 109833708632, 988503377684, 8896530399152, 80068773592364, 720618962331272, 6485570660981444, 58370135948832992, 525331223539496924 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

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

Index entries for linear recurrences with constant coefficients, signature (10,-9).

FORMULA

a(n) = 4*A187709(n).

a(n) = 9*a(n-1)-4.

a(n) = 10*a(n-1)-9*a(n-2).

G.f.: 4*(1-2*x)/((1-x)*(1-9*x)).

MATHEMATICA

(7*9^Range[0, 20]+1)/2 (* or *) LinearRecurrence[{10, -9}, {4, 32}, 20] (* Harvey P. Dale, Dec 08 2012 *)

PROG

(MAGMA) [(7*9^n+1)/2: n in [0..30]];

CROSSREFS

Sequence in context: A145710 A264633 A319183 * A110901 A295538 A256183

Adjacent sequences:  A199563 A199564 A199565 * A199567 A199568 A199569

KEYWORD

nonn,easy

AUTHOR

Vincenzo Librandi, Nov 08 2011

STATUS

approved

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Last modified February 18 21:20 EST 2020. Contains 332028 sequences. (Running on oeis4.)