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A013990 Number of edge-disjoint paths between opposite corners of n X n grid. 5
1, 1, 2, 16, 800, 323632, 1086297184, 30766606427588, 7466577706821521924, 15681997226277809235573754, 286995508313697459220070082104780, 45988915870193885369543805313062149050276 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

REFERENCES

rec.puzzles Dec 10 1995

LINKS

Table of n, a(n) for n=0..11.

CROSSREFS

Cf. A013991, A013992, A013993, A013994, A013995, A013996, A013997.

Sequence in context: A012920 A013088 A013137 * A013005 A013000 A013178

Adjacent sequences:  A013987 A013988 A013989 * A013991 A013992 A013993

KEYWORD

nonn,hard

AUTHOR

Dan Hoey

EXTENSIONS

a(10) and a(11) from Sean A. Irvine, Sep 24 2018

STATUS

approved

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Last modified August 23 12:02 EDT 2019. Contains 326222 sequences. (Running on oeis4.)