A237301 Number of (n+1)X(1+1) 0..2 arrays with the upper median of every 2X2 subblock equal

81, 435, 2174, 11545, 61055, 326262, 1745153, 9357963, 50227854, 269885945, 1451322519, 7810753350, 42066630913, 226720598435, 1222759174366, 6599028303897, 35636883752111, 192571672161174, 1041238183574337

Offset

1,1

Comments

Column 1 of A237308

Links

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

Formula

Empirical: a(n) = 9*a(n-1) -143*a(n-3) +79*a(n-4) +796*a(n-5) -292*a(n-6) -1760*a(n-7) +256*a(n-8) +1280*a(n-9)

Example

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

Crossrefs

Sequence in context: A237391 A237385 A237308 * A237945 A237938 A017630

Adjacent sequences: A237298 A237299 A237300 * A237302 A237303 A237304

Keyword

nonn

Author

R. H. Hardin, Feb 06 2014

Status

approved