A195968 Number of nX7 0..4 arrays with each element equal to the number its horizontal and vertical neighbors equal to itself

1, 1, 35, 222, 804, 2906, 13302, 45127, 175176, 652860, 2507734, 9514328, 36686968, 139109262, 525936593, 1999213462, 7634702278, 29077719792, 110526633168, 420713628093, 1600708836096, 6090478119209, 23178925704297, 88214394817266

Offset

1,3

Comments

Column 7 of A195969

Links

R. H. Hardin, Table of n, a(n) for n = 1..200

Example

Some solutions for n=4
..0..2..2..2..2..2..2....1..1..0..2..2..2..1....1..1..0..2..2..2..2
..2..2..0..1..1..0..2....0..2..2..2..0..2..1....2..2..1..2..1..0..2
..2..1..1..2..2..2..2....1..2..1..1..2..2..0....2..2..1..2..1..2..2
..2..2..2..2..1..1..0....1..2..2..2..2..1..1....1..1..0..2..2..2..0

Crossrefs

Sequence in context: A224104 A300523 A257758 * A104474 A171471 A223648

Adjacent sequences: A195965 A195966 A195967 * A195969 A195970 A195971

Keyword

nonn

Author

R. H. Hardin Sep 25 2011

Status

approved