A198249 Number of 2nX8 0..4 arrays with values 0..4 introduced in row major order and each element equal to exactly two horizontal and vertical neighbors

5, 485, 81440, 14520192, 2606019472, 468268681671, 84165911962889, 15129042589276259, 2719545932661264380, 488859618202335884730, 87876498667057316198136, 15796525069912515393284021

Offset

1,1

Comments

Column 4 of A198253

Links

R. H. Hardin, Table of n, a(n) for n = 1..51

Example

Some solutions for n=3
..0..0..1..1..2..2..3..3....0..0..1..1..2..2..1..1....0..0..1..1..2..2..3..3
..0..0..1..1..2..2..3..3....0..0..1..1..2..2..1..1....0..0..1..1..2..2..3..3
..3..3..2..2..3..3..2..2....1..1..0..0..3..3..2..2....1..1..3..3..4..4..2..2
..3..3..2..2..3..3..2..2....1..1..0..0..3..3..2..2....1..1..3..3..4..4..2..2
..1..1..3..3..2..2..4..4....3..3..2..2..4..4..3..3....3..3..1..1..0..0..4..4
..1..1..3..3..2..2..4..4....3..3..2..2..4..4..3..3....3..3..1..1..0..0..4..4

Crossrefs

Sequence in context: A321939 A198978 A206502 * A160363 A268113 A308132

Adjacent sequences: A198246 A198247 A198248 * A198250 A198251 A198252

Keyword

nonn

Author

R. H. Hardin Oct 22 2011

Status

approved