%I A057783
%S A057783 1,6,74,1257,25379,544108
%N A057783 Building block is 2 hexagons side-by-side; sequence gives number of pieces 
               (polydohexes) that can be formed from n such pairs of hexagons.
%D A057783 Computed by Brendan Owen.
%H A057783 Andrew Clarke, <a href="http://geocities.com/alclarke0/PolyPages/PolyX/
               PolyX.htm">Other Polyforms</a>
%Y A057783 Cf. A000228, A000105, A000665.
%Y A057783 Sequence in context: A135594 A058793 A066171 this_sequence A069852 A049235 
               A129031
%Y A057783 Adjacent sequences: A057780 A057781 A057782 this_sequence A057784 A057785 
               A057786
%K A057783 nonn,nice
%O A057783 1,2
%A A057783 N. J. A. Sloane (njas(AT)research.att.com), Oct 29 2000