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%I #15 Apr 01 2017 20:05:27
%S 448,1732,7918,39316,205628,1118398,6286658,36383284,216134044,
%T 1314160492,8155899320,51526819510,330559583178,2148524237842,
%U 14120142260138,93669254201140,626289974615094,4215364545901036,28531464984810918,194028126730583796
%N Number of ways to place 6n nonattacking kings on a 12 X 2n cylindrical chessboard.
%C This cylinder is horizontal: a chessboard where it is supposed that rows 1 and 2n are in contact (number of columns = 12, number of rows = 2n).
%H V. Kotesovec, <a href="https://oeis.org/wiki/User:Vaclav_Kotesovec">Number of ways of placing non-attacking queens, kings, bishops and knights</a>
%H Vaclav Kotesovec, <a href="/A194648/a194648.txt">G.f., recurrence and explicit formula</a>
%F Asymptotic: a(n) ~ 2*7^n.
%Y Cf. A174154, A194644, A194645, A194646, A194647, A137432, A195594.
%K nonn
%O 1,1
%A _Vaclav Kotesovec_, Aug 31 2011
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