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%I #23 Jul 02 2023 16:16:45
%S 15,54,141,324,699,1458,2985,6048,12183,24462,49029,98172,196467,
%T 393066,786273,1572696,3145551,6291270,12582717,25165620,50331435,
%U 100663074,201326361,402652944,805306119,1610612478,3221225205,6442450668,12884901603,25769803482
%N A hierarchical sequence (S(W3{2,2}*cc) - see A059126).
%H Jonas Wallgren, <a href="/A059126/a059126.txt">Hierarchical sequences</a>
%H <a href="/index/Rec#order_03">Index entries for linear recurrences with constant coefficients</a>, signature (4, -5, 2).
%F Conjectures from _Colin Barker_, Oct 07 2015: (Start)
%F a(n) = 3*(-11 + 2^(4+n) - 3*n) = 3*A109363(n+2).
%F a(n) = 4*a(n-1) - 5*a(n-2) + 2*a(n-3) for n > 2.
%F G.f.: 3*(2*x-5) / ((x-1)^2*(2*x-1)).
%F (End)
%Y Cf. A059126.
%K nonn
%O 0,1
%A _Jonas Wallgren_, Jan 19 2001
%E More terms from _Sean A. Irvine_, Sep 13 2022
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