A221197 - OEIS

A221197

Number of n X 4 arrays of occupancy after each element moves to some horizontal, diagonal or antidiagonal neighbor, with no occupancy greater than 2.

4, 196, 9025, 427716, 20277009, 961434049, 45583531009, 2161117565476, 102456463038084, 4857310924636921, 230276948274214416, 10917021188851445889, 517556134069075087921, 24536386370101531606209

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OFFSET

1,1

COMMENTS

Column 4 of A221200.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..25

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Cf. A221200.

Sequence in context: A219163 A017546 A144044 * A180991 A279803 A209288

Adjacent sequences: A221194 A221195 A221196 * A221198 A221199 A221200

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 04 2013

STATUS

approved