A237302 Number of (n+1)X(2+1) 0..2 arrays with the upper median of every 2X2 subblock equal

435, 5433, 60958, 731603, 8680769, 103860036, 1241171131, 14853266129, 177774735086, 2128825011971, 25500522192697, 305578699374348, 3663085862691715, 43926261284119777, 526926867807057006

Offset

1,1

Comments

Column 2 of A237308

Links

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

Formula

Empirical: a(n) = 22*a(n-1) -45*a(n-2) -1470*a(n-3) +5102*a(n-4) +32822*a(n-5) -127087*a(n-6) -302816*a(n-7) +1328815*a(n-8) +1050894*a(n-9) -6431720*a(n-10) -59412*a(n-11) +14013728*a(n-12) -5375984*a(n-13) -12300032*a(n-14) +7063680*a(n-15) +3032064*a(n-16) -1935360*a(n-17)

Example

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

Crossrefs

Sequence in context: A268475 A212227 A369153 * A124043 A345554 A345808

Adjacent sequences: A237299 A237300 A237301 * A237303 A237304 A237305

Keyword

nonn

Author

R. H. Hardin, Feb 06 2014

Status

approved