A196666 Expansion of (1-7x)/(1-22x).

1, 15, 330, 7260, 159720, 3513840, 77304480, 1700698560, 37415368320, 823138103040, 18109038266880, 398398841871360, 8764774521169920, 192825039465738240, 4242150868246241280, 93327319101417308160, 2053201020231180779520, 45170422445085977149440

Offset

0,2

Links

Table of n, a(n) for n=0..17.

Index entries for linear recurrences with constant coefficients, signature (22).

Formula

a(0) = 1, a(n) = 15*22^(n-1) for n>0.

a(n) = Sum_{k=0..n} A193722(n,k)*7^k.

Prog

(PARI) a(n)=if(n, 15*22^n--, 1) \\ Charles R Greathouse IV, Oct 06 2011

Crossrefs

Cf. A002001, A193722, A196660, A196661, A196662, A196663, A196664, A196665.

Sequence in context: A219253 A119296 A180779 * A025751 A027402 A053104

Adjacent sequences: A196663 A196664 A196665 * A196667 A196668 A196669

Keyword

nonn,easy,changed

Author

Philippe Deléham, Oct 05 2011

Status

approved