%I A153999
%S A153999 1,2,2,4,8,15,30,113,226,897,3372,13821,54535,410690,1677109,13057708,
%T A153999 99242206,798041029,6266181287,94041421473,762970233334,11832424270090,
%U A153999 179170668019138,2871889457030716,44959471542344339,1344474186700872579
%N A153999 Number of planar n X n X n binary triangular grids symmetric both under 
               120 degree rotation and reflection with no more than 12 ones in any 
               5 X 5 X 5 subtriangle.
%Y A153999 Sequence in context: A000018 A075126 A098788 this_sequence A154002 A154005 
               A054243
%Y A153999 Adjacent sequences: A153996 A153997 A153998 this_sequence A154000 A154001 
               A154002
%K A153999 nonn
%O A153999 0,2
%A A153999 Ron Hardin (rhhardin(AT)att.net) Jan 04 2009