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A235389 Number of paths joining opposite corners of an n X n grid with every vertex appearing at most twice in the path. 0
22, 9482, 112269228, 37515056726494, 355023905438833546724 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,1

LINKS

Table of n, a(n) for n=2..6.

EXAMPLE

The 22 paths in a 2 X 2 grid whose nodes are numbered from 1 to 4 in the natural way are 124, 134, 12124, 12134, 12424, 12434, 13124, 13134, 13424, 13434, 1212434, 1213424, 1213434, 1242134, 1243124, 1243134, 1312424, 1312434, 1313424, 1342124, 1342134, 1343124. - Giovanni Resta, Mar 24 2014

CROSSREFS

Cf. A007764, A239688.

Sequence in context: A200460 A202054 A279298 * A267491 A013727 A229346

Adjacent sequences:  A235386 A235387 A235388 * A235390 A235391 A235392

KEYWORD

nonn,more

AUTHOR

Muhammad Kholilurrohman, Jan 09 2014

EXTENSIONS

a(5)-a(6) from Muhammad Kholilurrohman, Nov 13 2014

STATUS

approved

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Last modified October 17 21:17 EDT 2021. Contains 348065 sequences. (Running on oeis4.)