A237635 Number of (n+1)X(6+1) 0..2 arrays with the upper median of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one

11936, 8594, 2900, 4440, 5656, 9368, 11984, 20756, 28336, 47134, 59920, 104172, 141680, 235572, 299600, 520860, 708400, 1177860, 1498000, 2604300, 3542000, 5889300, 7490000, 13021500, 17710000, 29446500, 37450000, 65107500, 88550000

Offset

1,1

Comments

Column 6 of A237637

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Formula

Empirical: a(n) = 5*a(n-4) for n>14

Example

Some solutions for n=5
..1..2..1..0..0..2..2....1..1..2..1..0..1..2....0..0..0..0..2..0..0
..0..0..2..1..0..1..2....1..2..0..0..0..2..1....0..2..1..0..1..2..1
..1..0..1..2..0..0..0....2..1..0..1..2..1..0....0..1..2..0..0..0..2
..2..0..0..0..2..1..0....0..0..0..2..0..0..0....0..0..0..2..1..0..1
..0..2..1..0..1..2..0....0..1..2..1..0..1..1....2..1..0..1..2..0..0
..0..1..2..0..0..0..2....1..2..0..0..0..2..2....0..2..0..0..1..2..1

Crossrefs

Sequence in context: A230680 A218458 A321157 * A344629 A252948 A065701

Adjacent sequences: A237632 A237633 A237634 * A237636 A237637 A237638

Keyword

nonn

Author

R. H. Hardin, Feb 10 2014

Status

approved