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A135442
Number of partitions into "bus routes" of n X n grid.
0
OFFSET
1,1
COMMENTS
1. One and only one route exists on all edges of G
2. Terminals of two different routes don't meet on the same point
CROSSREFS
Cf. A131709.
Sequence in context: A005832 A195501 A075768 * A086895 A293241 A220646
KEYWORD
nonn,more,bref
AUTHOR
Yasutoshi Kohmoto, Feb 18 2008
STATUS
approved