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%I #9 Sep 24 2020 19:59:05
%S 1,3,5,12,23,43,81,148,266,476,842,1478,2581,4481,7743,13328,22857,
%T 39073,66605,113242,192084,325128,549252,926220,1559353,2621295,
%U 4400249,7376868,12352043,20659159,34516377
%N a(n) = A215082(2*n+1).
%H <a href="/index/Rec#order_06">Index entries for linear recurrences with constant coefficients</a>, signature (1,2,1,-2,-3,-1).
%F a(n) = a(n-1) + 2*a(n-2) + a(n-3) - 2*a(n-4) - 3*a(n-5) - a(n-6), a(0) = 1, a(1) = 3, a(2) = 5, a(3) = 12, a(4) = 23, a(5) = 43.
%F G.f.: (2*x+1)/((x^2+x+1)*((x^2+x-1)^2).
%Y Cf. A000045, A023607, A215082, A215108.
%K nonn,easy
%O 0,2
%A _Philippe Deléham_, Aug 03 2012
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