A236738 Number of (n+1)X(n+1) 0..2 arrays with the upper median plus the lower median of every 2X2 subblock equal

81, 1411, 68839, 17740369, 14977205669, 41970035313995, 367339284802529639, 10214681449663016578969, 894198234345435455356272041

Offset

1,1

Comments

Diagonal of A236746

Links

Table of n, a(n) for n=1..9.

Example

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

Crossrefs

Sequence in context: A116205 A237455 A253488 * A236801 A282646 A283542

Adjacent sequences: A236735 A236736 A236737 * A236739 A236740 A236741

Keyword

nonn

Author

R. H. Hardin, Jan 30 2014

Status

approved