id:A013991 - OEIS Search Results

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Edge-disjoint paths between opposite corners of 2 X n grid.

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1, 1, 4, 16, 72, 335, 1562, 7273, 33850, 157534, 733148, 3412005, 15879172, 73900265, 343925312, 1600598044, 7449042040, 34667184251, 161338016046, 750852888177, 3494403076902, 16262643529850 (list; graph; listen)

	OFFSET	`0,3`
	REFERENCES	`rec.puzzles Dec 10 1995.`
	FORMULA	`G.f.: (-7x^6+15x^5-12x^4+2x^3+4x^2-5x+1)/[(1-x+x^2)(1-5x+9x^3-7x^4)].`
	CROSSREFS	`Sequence in context: A133789 A091354 A124533 this_sequence A129872 A059371 A007234` `Adjacent sequences: A013988 A013989 A013990 this_sequence A013992 A013993 A013994`
	KEYWORD	`nonn,hard`
	AUTHOR	`Dan Hoey (Hoey(AT)AIC.NRL.Navy.Mil)`

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Last modified August 29 17:54 EDT 2008. Contains 143238 sequences.

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