A236896 Number of (n+1)X(2+1) 0..2 arrays with the maximum plus the upper median of every 2X2 subblock equal

339, 3205, 30644, 337861, 3782769, 43538228, 504121651, 5869125835, 68447883704, 799193185177, 9335513529061, 109078340464240, 1274639900671115, 14895774356170087, 174080704237509648, 2034438282599485301

Offset

1,1

Comments

Column 2 of A236902

Links

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

Formula

Empirical: a(n) = 20*a(n-1) -50*a(n-2) -1079*a(n-3) +5929*a(n-4) +13546*a(n-5) -136152*a(n-6) +32559*a(n-7) +1230196*a(n-8) -1321510*a(n-9) -5558982*a(n-10) +8606104*a(n-11) +13433556*a(n-12) -26908536*a(n-13) -16223728*a(n-14) +45800336*a(n-15) +5469360*a(n-16) -41824640*a(n-17) +6747552*a(n-18) +17907200*a(n-19) -5889280*a(n-20) -2304000*a(n-21) +921600*a(n-22)

Example

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

Crossrefs

Sequence in context: A158000 A252447 A252441 * A076748 A306865 A205223

Adjacent sequences: A236893 A236894 A236895 * A236897 A236898 A236899

Keyword

nonn

Author

R. H. Hardin, Feb 01 2014

Status

approved