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A176710 Mix A001021, 2*A001021. 0

%I

%S 1,2,12,24,144,288,1728,3456,20736,41472,248832,497664,2985984,

%T 5971968,35831808,71663616,429981696,859963392,5159780352,10319560704,

%U 61917364224

%N Mix A001021, 2*A001021.

%C Divides A091137. See A165313.

%H <a href="/index/Rec">Index entries for linear recurrences with constant coefficients</a>, signature (0,12).

%H <a href="/index/Di#divseq">Index to divisibility sequences</a>

%F a(n)= +12*a(n-2). G.f.: ( -1-2*x ) / ( -1+12*x^2 ). [From _R. J. Mathar_, Apr 26 2010]

%F a(n)=(1/12)*[3-1*(-1)^n]*{12^(1/2)*n*12^[(1/4)*(-1)^n]*108^(1/4)}, with n>=0 [From _Paolo P. Lava_, May 21 2010]

%K nonn,easy

%O 0,2

%A _Paul Curtz_, Apr 24 2010

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Last modified May 26 09:27 EDT 2019. Contains 323579 sequences. (Running on oeis4.)