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Search: id:A054252
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| A054252 |
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Triangle T(n,k) of n X n binary matrices with k=0..n^2 ones under action of dihedral group of the square D_4. |
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8
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| 1, 1, 1, 1, 1, 2, 1, 1, 1, 3, 8, 16, 23, 23, 16, 8, 3, 1, 1, 3, 21, 77, 252, 567, 1051, 1465, 1674, 1465, 1051, 567, 252, 77, 21, 3, 1, 1, 6, 49, 319, 1666, 6814, 22475, 60645, 136080, 256585, 410170, 559014, 652048, 652048, 559014, 410170, 256585, 136080
(list; graph; listen)
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OFFSET
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0,6
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EXAMPLE
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[1], [1, 1], [1, 1, 2, 1, 1], [1, 3, 8, 16, 23, 23, 16, 8, 3, 1], ...
There are 8 nonisomorphic 3 X 3 binary matrices with two ones under action of D_4:
[0 0 0] [0 0 0] [0 0 0] [0 0 0] [0 0 0] [0 0 0] [0 0 0] [0 0 1]
[0 0 0] [0 0 0] [0 0 1] [0 0 1] [0 1 0] [0 1 0] [1 0 1] [0 0 0]
[0 1 1] [1 0 1] [0 1 0] [1 0 0] [0 0 1] [0 1 0] [0 0 0] [1 0 0].
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CROSSREFS
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Cf. A019318, A014409.
Sequence in context: A144150 A124560 A112707 this_sequence A007442 A054772 A085384
Adjacent sequences: A054249 A054250 A054251 this_sequence A054253 A054254 A054255
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KEYWORD
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easy,nonn,tabf
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AUTHOR
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Vladeta Jovovic (vladeta(AT)eunet.rs), May 04 2000
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