login

Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.

A237226
Number of (n+1) X (n+1) 0..2 arrays with the maximum plus the minimum of every 2 X 2 subblock differing from its horizontal and vertical neighbors by exactly one.
0
81, 984, 12014, 83436, 721854, 5016852, 42143930, 257895268, 2084528746, 12713615332, 102302637674, 609602834160, 4861186951014, 29162489418784, 231673032285662, 1389160154318372
OFFSET
1,1
COMMENTS
Diagonal of A237234.
EXAMPLE
Some solutions for n=4
..1..0..2..1..2....1..0..2..2..1....0..0..2..2..0....1..1..2..1..0
..1..1..2..1..0....0..0..1..1..0....0..1..1..2..2....1..0..1..2..2
..1..1..1..0..1....0..0..1..1..1....2..1..0..1..2....2..1..0..1..1
..2..1..1..1..2....0..1..2..1..1....1..2..1..1..0....2..2..1..1..1
..2..0..0..2..2....0..2..1..0..1....0..1..1..1..0....0..2..2..0..0
CROSSREFS
Cf. A237234.
Sequence in context: A206269 A236885 A205729 * A237159 A183807 A264203
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 05 2014
STATUS
approved