A237407 Number of (n+1) X (3+1) 0..2 arrays with the maximum plus the upper median plus the minimum of every 2 X 2 subblock differing from its horizontal and vertical neighbors by exactly one.

1278, 8236, 53167, 373804, 2671962, 18401364, 125750824, 872440876, 6089994150, 42113161848, 291069201134, 2016256423968, 14003302227390, 96905004811952, 671377683662330, 4648755970028064, 32248931393362930, 223222561428051576

Offset

1,1

Comments

Column 3 of A237412.

Links

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

Example

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

Crossrefs

Sequence in context: A210365 A190831 A202643 * A251097 A031798 A293923

Adjacent sequences: A237404 A237405 A237406 * A237408 A237409 A237410

Keyword

nonn

Author

R. H. Hardin, Feb 07 2014

Status

approved