|
%I #6 Apr 06 2016 08:52:31
%S 10,45,150,375,750,1200,1713,2227,2492,2492,2225,2041,1575,1132,770,
%T 571,335,180,90,44,18,12,6,3,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
%U 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
%N Number of terms in A144688 of length n.
%C Since any 5-digit member of A144688 must end in 0 or 5, a(5) = 2*a(4).
%C Similarly a(n) <= 2*a(n-1) for n = 6, 7, 8, 9, a(10) = a(9), and a(n) <= a(n-1) for n >= 11.
%C a(n) = 0 for n > 25.
%Y Cf. A144688.
%K nonn,base
%O 1,1
%A _Zak Seidov_ and _N. J. A. Sloane_, Feb 08 2009
|
