login
This site is supported by donations to The OEIS Foundation.

 

Logo

Invitation: celebrating 50 years of OEIS, 250000 sequences, and Sloane's 75th, there will be a conference at DIMACS, Rutgers, Oct 9-10 2014.

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A048141 Number of symmetrical planar partitions of n: planar partitions (A000219) that when regarded as 3-D objects have a threefold axis of symmetry that is the intersection of 3 mirror planes, i.e. C3v symmetry. 13
1, 0, 0, 1, 0, 0, 2, 1, 0, 2, 1, 0, 2, 1, 0, 3, 2, 0, 4, 4, 0, 4, 5, 0, 5, 7, 1, 6, 9, 1, 6, 11, 1, 8, 15, 2, 10, 20, 3, 10, 25, 4, 12, 33, 7, 14, 40, 9, 15, 48, 12, 18, 60, 17, 20, 74, 23, 22, 89, 30, 26, 108, 40, 30, 130, 51, 33, 157, 66, 37, 187, 85, 42, 222, 108, 47, 262, 136, 54 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,7

LINKS

Wouter Meeussen, Table of n, a(n) for n=1..151

EXAMPLE

The plane partition {{2,1},{1}} has C3v symmetry.

CROSSREFS

Cf. A000784, A000785, A000786, A000219, A005987, A048142, A051056-A051061, A096419.

Sequence in context: A196279 A132798 A080425 * A025664 A025854 A190766

Adjacent sequences:  A048138 A048139 A048140 * A048142 A048143 A048144

KEYWORD

nice,nonn

AUTHOR

Wouter Meeussen

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified August 28 21:32 EDT 2014. Contains 246183 sequences.