A196512 Expansion of (1-9x)/(1-28x).

1, 19, 532, 14896, 417088, 11678464, 326996992, 9155915776, 256365641728, 7178237968384, 200990663114752, 5627738567213056, 157576679881965568, 4412147036695035904, 123540117027461005312

Offset

0,2

Links

Vincenzo Librandi, Table of n, a(n) for n = 0..500

Index entries for linear recurrences with constant coefficients, signature (28).

Formula

a(n) = 19*28^(n-1) for n > 0, a(0)=1.

a(n) = Sum_{k=0..n} A193722(n,k)*9^k.

Mathematica

Join[{1}, 19*28^Range[0, 20]] (* Harvey P. Dale, Dec 06 2015 *)

Prog

(PARI) a(n)=if(n, 19*28^(n-1), 1)  \\ M. F. Hasler, Oct 06 2011
(Magma) [1], [19*28^(n-1) : n in [1..15]]; // Vincenzo Librandi, Oct 06 2011

Crossrefs

Cf. A002001, A196660-A196666, A196676.

Sequence in context: A009081 A057644 A283382 * A027406 A053116 A309313

Adjacent sequences: A196509 A196510 A196511 * A196513 A196514 A196515

Keyword

nonn,easy

Author

Philippe Deléham, Oct 05 2011

Status

approved