A236803 Number of (n+1)X(2+1) 0..2 arrays with the maximum plus the lower median minus the upper median minus the minimum of every 2X2 subblock equal.

277, 1435, 8825, 60187, 410305, 2926867, 20377961, 147734251, 1039350577, 7613312515, 53944065785, 398046992347, 2834584305025, 21024264295027, 150246189753161, 1118382878221771, 8011732148951377, 59783309384192995

Offset: 1

Author

R. H. Hardin, Jan 31 2014

Keywords

• nonn

Comments

Column 2 of A236809

Examples

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

Links

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

Formula

Empirical: a(n) = 12*a(n-1) +15*a(n-2) -672*a(n-3) +2434*a(n-4) +864*a(n-5) -17988*a(n-6) +24192*a(n-7) +14472*a(n-8) -46656*a(n-9) +23328*a(n-10)