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%I #22 Jan 29 2024 06:14:39

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

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

%U 61917364224,123834728448,743008370688,1486016741376,8916100448256,17832200896512,106993205379072,213986410758144

%N Mix A001021, 2*A001021.

%C Divides A091137. See A165313.

%H <a href="/index/Rec#order_02">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 ). [_R. J. Mathar_, Apr 26 2010]

%t LinearRecurrence[{0, 12}, {1, 2}, 30] (* _Paolo Xausa_, Jan 29 2024 *)

%K nonn,easy

%O 0,2

%A _Paul Curtz_, Apr 24 2010

%E a(21)-a(27) from _Paolo Xausa_, Jan 29 2024