A221779 - OEIS

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A221779

Number of nX4 arrays of occupancy after each element stays put or moves to some horizontal, diagonal or antidiagonal neighbor, without move-in move-out left turns

21, 2631, 311500, 36959565, 4383899151, 519828193272, 61646570104772, 7310747898489930, 866987511530643810, 102816641533831938240, 12193094561710087236373, 1445987266172531006933514

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

Column 4 of A221780

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..54

EXAMPLE

Some solutions for n=3

..0..2..1..0....0..2..1..2....0..1..3..2....0..1..0..2....0..3..0..1

..1..2..0..0....0..1..0..2....1..0..0..1....0..1..2..0....1..0..0..3

..0..2..3..1....3..0..0..1....1..0..3..0....2..2..0..2....0..1..2..1