# Greetings from The On-Line Encyclopedia of Integer Sequences! http://oeis.org/ Search: id:a048142 Showing 1-1 of 1 %I A048142 #11 Aug 03 2017 01:36:25 %S A048142 0,0,0,0,0,0,0,0,0,0,0,0,1,1,0,1,1,0,2,2,0,3,3,0,5,6,0,7,9,0,11,16,1, %T A048142 14,23,2,20,36,4,27,52,7,37,78,13,48,111,21,65,163,36,83,227,56,109, %U A048142 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, Table of n, a(n) for n = 1..151 %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. A000219, A000784, A000785, A000786, A005987, A048141, A051056-A051061, A096419. %K A048142 nice,nonn %O A048142 1,19 %A A048142 _Wouter Meeussen_ # Content is available under The OEIS End-User License Agreement: http://oeis.org/LICENSE