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

1,1

Comments

Column 2 of A236809

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)

Example

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

Crossrefs

Sequence in context: A142831 A105977 A297891 * A048525 A189609 A264371

Adjacent sequences: A236800 A236801 A236802 * A236804 A236805 A236806

Keyword

nonn

Author

R. H. Hardin, Jan 31 2014

Status

approved