A221393 Number of 7Xn arrays of occupancy after each element moves to some horizontal or antidiagonal neighbor, with no 2-loops and with no occupancy greater than 2

0, 0, 364, 2420113, 2188482014, 2468313810280, 2142967506078650, 1939585877435608615, 1666732821075006620356, 1442175413154162238317806

Offset

1,3

Comments

Row 7 of A221388

Links

Table of n, a(n) for n=1..10.

Example

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

Crossrefs

Sequence in context: A249671 A022196 A098252 * A099113 A350555 A073304

Adjacent sequences: A221390 A221391 A221392 * A221394 A221395 A221396

Keyword

nonn

Author

R. H. Hardin, Jan 14 2013

Status

approved