id:A000644 - OEIS Search Results

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Loops of length 4n on square grid that turn at each step and return to start in original direction.

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1, 1, 3, 7, 31, 138, 808, 4956, 33047, 227328 (list; graph; listen)

	OFFSET	`0,3`
	REFERENCES	`D. E. Knuth, The Texbook, p. 390.` `D. E. Knuth, personal communication.`
	CROSSREFS	`Sequence in context: A123488 A121620 A042271 this_sequence A015459 A115083 A141385` `Adjacent sequences: A000641 A000642 A000643 this_sequence A000645 A000646 A000647`
	KEYWORD	`nonn,nice`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com).`

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Last modified November 27 14:50 EST 2009. Contains 167570 sequences.