A238174 Number of (n+1)X(2+1) 0..2 arrays with the maximum plus the minimum of every 2X2 subblock equal

423, 5321, 69023, 938601, 12951743, 180345769, 2520461647, 35289713177, 494500172559, 6931846504281, 97186455651295, 1362689160952841, 19107483153243615, 267927527528514313, 3756941779561193327

Offset

1,1

Comments

Column 2 of A238180

Links

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

Formula

Empirical: a(n) = 22*a(n-1) -111*a(n-2) -106*a(n-3) +1473*a(n-4) -2198*a(n-5) -121*a(n-6) +1514*a(n-7) -472*a(n-8)

Example

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

Crossrefs

Sequence in context: A206662 A205831 A206408 * A251013 A230678 A091293

Adjacent sequences: A238171 A238172 A238173 * A238175 A238176 A238177

Keyword

nonn

Author

R. H. Hardin, Feb 19 2014

Status

approved