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%I #23 Dec 30 2014 13:11:50
%S 1,5,13,29,69,197,669,2509,9813,38965,155501,621565,2485733,9942309,
%T 39768509,159073197,636291829,2545166229,10180663693,40722653405,
%U 162890612101,651562446725,2606249785053,10424999138189
%N The bisection of A238315 that remains constant with changes in the offset of the exponent of the second term.
%C Last digits repeat {1,5,3,9,9,7,9,9,3,5}
%F Conjectures from _Colin Barker_, Dec 30 2014: (Start)
%F a(n) = (-1+4^n-12*n+36*n^2)/27.
%F a(n) = 6*a(n-1)-8*a(n-2)-2*a(n-3)+9*a(n-4)-4*a(n-5).
%F G.f.: -x*(7*x^2+2*x-1) / ((x-1)^3*(4*x-1)).
%F (End)
%Y Cf. A238315.
%K nonn
%O 1,2
%A _Richard R. Forberg_, Mar 30 2014
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