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a(n) = 10^n*(3 + 7*10^n) + 7.
0

%I #13 Aug 08 2022 17:22:51

%S 17,737,70307,7003007,700030007,70000300007,7000003000007,

%T 700000030000007,70000000300000007,7000000003000000007,

%U 700000000030000000007,70000000000300000000007,7000000000003000000000007,700000000000030000000000007,70000000000000300000000000007

%N a(n) = 10^n*(3 + 7*10^n) + 7.

%H <a href="/index/Rec#order_03">Index entries for linear recurrences with constant coefficients</a>, signature (111,-1110,1000).

%F From _Chai Wah Wu_, Aug 06 2022: (Start)

%F a(n) = 111*a(n-1) - 1110*a(n-2) + 1000*a(n-3) for n > 2.

%F G.f.: (-7370*x^2 + 1150*x - 17)/((x - 1)*(10*x - 1)*(100*x - 1)). (End)

%K easy,nonn

%O 0,1

%A _Jason Earls_, Dec 18 2009