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A000512 Number of equivalence classes of n X n matrices over {0,1} with rows and columns summing to 3, where equivalence is defined by row and column permutations. Isomorphism classes of bicolored cubic bipartite graphs, where isomorphism cannot exchange the colors. +0
5
0, 0, 1, 1, 2, 7, 16, 51, 224, 1165, 7454, 56349, 481309, 4548786 (list; graph; listen)
OFFSET

0,5

REFERENCES

Goulden and Jackson, Combin. Enum., Wiley, 1983 p. 284.

LINKS

Index entries for sequences related to Latin squares and rectangles

CROSSREFS

Cf. A000186.

Cf. A000513.

Sequence in context: A113224 A026571 A100099 this_sequence A084079 A042689 A073998

Adjacent sequences: A000509 A000510 A000511 this_sequence A000513 A000514 A000515

KEYWORD

nonn,hard

AUTHOR

Eric Rogoyski

EXTENSIONS

Definition corrected by Brendan McKay (bdm(AT)cs.anu.edu.au), May 28 2006

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Last modified July 25 07:41 EDT 2008. Contains 142293 sequences.


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