A221815 Number of nX4 arrays of occupancy after each element moves to some horizontal, diagonal or antidiagonal neighbor, without move-in move-out straight through or left turns

1, 91, 1041, 29412, 574706, 13076919, 280280821, 6157362467, 133971367251, 2926556131807, 63829507756107, 1393042238694910, 30394642476262010, 663246016374693512, 14472196608372584944, 315792262364985554100

Offset

1,2

Comments

Column 4 of A221817

Links

R. H. Hardin, Table of n, a(n) for n = 1..30

Example

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

Crossrefs

Sequence in context: A036526 A170955 A020316 * A195221 A213559 A120756

Adjacent sequences: A221812 A221813 A221814 * A221816 A221817 A221818

Keyword

nonn

Author

R. H. Hardin Jan 26 2013

Status

approved