A097167 - OEIS

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A097167

3*10^n-2*9^n.

1, 12, 138, 1542, 16878, 181902, 1937118, 20434062, 213906558, 2225159022, 23026431198, 237237880782, 2435140927038, 24916268343342, 254246415090078, 2588217735810702, 26293959622296318, 266645636600666862

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OFFSET

0,2

COMMENTS

Partial sums are A097168.

LINKS

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

Index entries for linear recurrences with constant coefficients, signature (19,-90).

FORMULA

G.f. : (1-7x)/((1-9x)(1-10x)); a(n)=19a(n-1)-90a(n-2).

CROSSREFS

Sequence in context: A059517 A243966 A377234 * A125469 A113366 A360203

Adjacent sequences: A097164 A097165 A097166 * A097168 A097169 A097170

KEYWORD

easy,nonn

AUTHOR

Paul Barry, Jul 30 2004

STATUS

approved