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%I #8 Jan 02 2024 08:56:38
%S 1,9,162,2268,34992,519048,7820712,117100728,1757770632,26359001208,
%T 395430367752,5931183418488,88969383864072,1334530962440568,
%U 20018023209731592,300269995507235448,4504052048440962312
%N a(n)=9*a(n-1)+90*a(n-2) for n>=3, a(0)=1, a(1)=9, a(2)=162 .
%F G.f.: (1-9*x^2)/(1-9*x-90*x^2) . a(n) = Sum_{k, 0<=k<=n}A122950(n,k)*9^k .
%K easy,nonn
%O 0,2
%A _Philippe Deléham_, Dec 31 2007
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