A221612 Number of 4Xn arrays of occupancy after each element moves to some horizontal or antidiagonal neighbor, without move-in move-out left turns

0, 8, 287, 12270, 472974, 18561474, 730077217, 28767381806, 1133353855049, 44645624030182, 1758539674266383, 69265063373736612, 2728173710022769575, 107455513583959689740, 4232383298478054347329, 166702136284618558999914

Offset

1,2

Comments

Row 4 of A221609

Links

R. H. Hardin, Table of n, a(n) for n = 1..18

Example

Some solutions for n=3
..0..2..0....0..1..1....0..2..1....1..2..0....0..2..1....1..2..0....0..2..1
..1..2..0....0..3..1....0..2..0....0..2..0....0..2..0....0..2..1....0..2..1
..1..2..0....1..2..1....2..2..0....2..2..0....1..2..0....0..1..1....0..3..1
..2..2..0....0..2..0....0..2..1....0..2..1....2..2..0....1..3..0....0..1..1

Crossrefs

Sequence in context: A247484 A136364 A089670 * A348122 A060355 A060859

Adjacent sequences: A221609 A221610 A221611 * A221613 A221614 A221615

Keyword

nonn

Author

R. H. Hardin Jan 20 2013

Status

approved