A209791 Half the number of (n+1)X4 0..2 arrays with every 2X2 subblock having exactly one duplicate clockwise edge difference

1380, 49056, 1732554, 61289190, 2167312950, 76648760118, 2710658447034, 95862567834618, 3390172069647198, 119893318115163858, 4240021127786852970, 149948156963937950274, 5302909535051211495570, 187537150802706970729950

Offset

1,1

Comments

Column 3 of A209796

Links

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

Formula

Empirical: a(n) = 23*a(n-1) +474*a(n-2) -947*a(n-3) -13207*a(n-4) +27207*a(n-5) +14500*a(n-6) -33255*a(n-7) -1722*a(n-8) +5600*a(n-9) +816*a(n-10)

Example

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

Crossrefs

Sequence in context: A204056 A204049 A204048 * A051114 A139667 A031796

Adjacent sequences: A209788 A209789 A209790 * A209792 A209793 A209794

Keyword

nonn

Author

R. H. Hardin Mar 13 2012

Status

approved