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

Offset: 0

Author

Paul Barry, Jul 30 2004

Keywords

• easy
• nonn

Comments

Partial sums are A097168.

Links

• 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).