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 A199565 (7*9^n+1)/4. 1
 2, 16, 142, 1276, 11482, 103336, 930022, 8370196, 75331762, 677985856, 6101872702, 54916854316, 494251688842, 4448265199576, 40034386796182, 360309481165636, 3242785330490722, 29185067974416496, 262665611769748462 (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) = 2*A187709(n). a(n) = 9*a(n-1)-2. a(n) = 10*a(n-1)-9*a(n-2). G.f.: 2*(1-2*x)/((1-x)*(1-9*x)). MATHEMATICA LinearRecurrence[{10, -9}, {2, 16}, 30] (* Harvey P. Dale, Mar 14 2015 *) PROG (MAGMA) [(7*9^n+1)/4: n in [0..30]]; CROSSREFS Sequence in context: A002302 A056662 A151402 * A003768 A214767 A300412 Adjacent sequences:  A199562 A199563 A199564 * A199566 A199567 A199568 KEYWORD nonn,easy AUTHOR Vincenzo Librandi, Nov 08 2011 STATUS approved

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Last modified October 15 18:26 EDT 2019. Contains 328037 sequences. (Running on oeis4.)