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A048142
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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.
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13
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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, 14, 23, 2, 20, 36, 4, 27, 52, 7, 37, 78, 13, 48, 111, 21, 65, 163, 36, 83, 227, 56, 109, 322, 89, 139, 444, 135, 179, 618, 207, 226, 841, 305, 288, 1151, 453, 361
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,19
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LINKS
| Wouter Meeussen, Table of n, a(n) for n=1..151
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EXAMPLE
| The plane partitions {{3, 2, 2}, {3, 1}, {1, 1}} and {{3, 2, 2}, {3, 2}, {1, 1}} have C3 symmetry.
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CROSSREFS
| Cf. A000784, A000785, A000786, A000219, A005987, A048141, A051056-A051061, A096419.
Sequence in context: A128615 A087508 A095731 * A071426 A135356 A191362
Adjacent sequences: A048139 A048140 A048141 * A048143 A048144 A048145
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KEYWORD
| nice,nonn
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AUTHOR
| Wouter Meeussen (wouter.meeussen(AT)pandora.be)
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