A236895 Number of (n+1)X(1+1) 0..2 arrays with the maximum plus the upper median of every 2X2 subblock equal

81, 339, 1426, 6545, 30727, 148966, 734805, 3679063, 18601074, 94728601, 484797943, 2489729974, 12816761181, 66088527271, 341168095114, 1762603785057, 9111229406855, 47115466594414, 243704127371685, 1260784775294295

Offset

1,1

Comments

Column 1 of A236902

Links

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

Formula

Empirical: a(n) = 9*a(n-1) -187*a(n-3) +343*a(n-4) +1052*a(n-5) -2856*a(n-6) -1872*a(n-7) +8792*a(n-8) -856*a(n-9) -11368*a(n-10) +5024*a(n-11) +4992*a(n-12) -3072*a(n-13)

Example

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

Crossrefs

Sequence in context: A237868 A237861 A236902 * A237965 A238046 A237958

Adjacent sequences: A236892 A236893 A236894 * A236896 A236897 A236898

Keyword

nonn

Author

R. H. Hardin, Feb 01 2014

Status

approved