%I A057818
%S A057818 0,1,6,33,108,345,1014,2865,7464,19791,51286,133249
%N A057818 Number of factorable (see A057765 for definition) subsets of a 2 X n 
               uniform grid.
%e A057818 There are six factorable subsets of
%e A057818 [___] namely [11_] [1_1] [_11] [111] [_11] [11_]
%e A057818 [___] ...... [22_] [2_2] [_22] [222] [22_] [_22], so a(3) = 6
%e A057818 (the numerals denote the elements of a particular translated copy).
%Y A057818 See A057765 and A057750.
%Y A057818 Sequence in context: A157872 A153127 A135526 this_sequence A063267 A082106 
               A073375
%Y A057818 Adjacent sequences: A057815 A057816 A057817 this_sequence A057819 A057820 
               A057821
%K A057818 nonn,nice,more
%O A057818 1,3
%A A057818 John W. Layman (layman(AT)math.vt.edu), Nov 07 2000