A235898 Number of (n+1)X(4+1) 0..2 arrays with the minimum plus the maximum equal to the lower median plus the upper median in every 2X2 subblock.

1797, 17001, 148945, 1384257, 12931393, 124394337, 1221438401, 12293017761, 126561018497, 1332373322337, 14316580780609, 156716540659233, 1743686518531585, 19674932381346273, 224642399432061377

Offset

1,1

Comments

Column 4 of A235902

Links

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

Formula

Empirical: a(n) = 33*a(n-1) -312*a(n-2) -360*a(n-3) +16976*a(n-4) -22128*a(n-5) -360576*a(n-6) +253440*a(n-7) +3520512*a(n-8) +3870720*a(n-9)

Example

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

Crossrefs

Sequence in context: A249191 A234203 A220058 * A035891 A069476 A395197

Adjacent sequences: A235895 A235896 A235897 * A235899 A235900 A235901

Keyword

nonn

Author

R. H. Hardin, Jan 16 2014

Status

approved