id:A077550 - OEIS Search Results

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Number of nonisomorphic ways a river (or undirected line) can cross two perpendicular roads n times (orbits of A076875 under symmetry group of order 8).

+0
2

1, 1, 2, 3, 9, 21, 54, 131 (list; graph; listen)

	OFFSET	`0,3`
	COMMENT	`There is no constraint on touching any particular sector.`
	CROSSREFS	`Cf. A076875 (total number of solutions), A076906, A076907 (if line is directed)` `Adjacent sequences: A077547 A077548 A077549 this_sequence A077551 A077552 A077553` `Sequence in context: A015951 A101531 A099607 this_sequence A056780 A141505 A111360`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com) and Jon Wild (wild(AT)music.mcgill.ca), Aug 25 2003`

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Last modified November 8 20:39 EST 2009. Contains 166234 sequences.

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