%I A048142
%S A048142 0,0,0,0,0,0,0,0,0,0,0,0,1,1,0,1,1,0,2,2,0,3,3,0,5,6,0,7,9,0,11,16,
%T A048142 1,14,23,2,20,36,4,27,52,7,37,78,13,48,111,21,65,163,36,83,227,56,
%U A048142 109,322,89,139,444,135,179,618,207,226,841,305,288,1151,453,361
%N A048142 Number of symmetrical planar partitions of n: planar partitions (A000219) 
               that when regarded as 3-D objects have only a threefold axis of symmetry, 
               i.e. C3 symmetry.
%H A048142 Wouter Meeussen, <a href="b048142.txt">Table of n, a(n) for n=1..151</
               a>
%e A048142 The plane partitions {{3, 2, 2}, {3, 1}, {1, 1}} and {{3, 2, 2}, {3, 
               2}, {1, 1}} have C3 symmetry.
%Y A048142 Cf. A000784, A000785, A000786, A000219, A005987, A048141, A051056-A051061, 
               A096419.
%Y A048142 Sequence in context: A128615 A087508 A095731 this_sequence A071426 A137422 
               A139139
%Y A048142 Adjacent sequences: A048139 A048140 A048141 this_sequence A048143 A048144 
               A048145
%K A048142 nice,nonn
%O A048142 1,19
%A A048142 Wouter Meeussen (wouter.meeussen(AT)pandora.be)