A221819 Number of 3Xn arrays of occupancy after each element moves to some horizontal, diagonal or antidiagonal neighbor, without move-in move-out straight through or left turns

0, 12, 14, 1041, 7320, 123644, 1271018, 17049353, 196353922, 2459348722, 29384305780, 360468322267, 4356949776930, 53099711422957, 644154946941384, 7834538105922852, 95149701105775632, 1156519086175555400

Offset

1,2

Comments

Row 3 of A221817

Links

R. H. Hardin, Table of n, a(n) for n = 1..62

Example

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

Crossrefs

Sequence in context: A002926 A318298 A139310 * A329026 A307535 A180575

Adjacent sequences: A221816 A221817 A221818 * A221820 A221821 A221822

Keyword

nonn

Author

R. H. Hardin Jan 26 2013

Status

approved