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A059138 A hierarchical sequence (S(W3{2,2}cc) - see A059126). 0

%I

%S 18,90,270,666,1494,3186,6606,13482,27270,54882,110142,220698,441846,

%T 884178,1768878

%N A hierarchical sequence (S(W3{2,2}cc) - see A059126).

%H J. Wallgren, <a href="/A059126/a059126.txt">Hierarchical sequences</a>

%F Conjectures from _Colin Barker_, Oct 07 2015: (Start)

%F a(n) = 18*(-5+3*2^(1+n)-2*n) = 18*A050488(n+1).

%F a(n) = 4*a(n-1)-5*a(n-2)+2*a(n-3) for n>2.

%F G.f.: -18*(x+1) / ((x-1)^2*(2*x-1)).

%F (End)

%K easy,nonn,more

%O 0,1

%A _Jonas Wallgren_, Jan 19 2001

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Last modified March 5 11:57 EST 2021. Contains 341823 sequences. (Running on oeis4.)