A183793 1/4 the number of (n+1) X (n+1) 0..3 arrays with no 2 X 2 subblock having sum 6.

53, 31541, 209636605, 15624102535570, 13038188765075658693, 121880956287359200992546463

Offset

1,1

Comments

Diagonal of A183802.

Links

Table of n, a(n) for n=1..6.

Example

Some solutions for 3 X 3:
..2..2..0....1..0..3....1..2..0....0..0..2....2..1..3....0..1..0....2..3..3
..2..1..1....2..2..3....0..1..1....3..2..1....3..3..1....1..0..1....3..3..2
..3..3..3....3..0..2....1..3..0....3..2..3....3..1..3....0..1..2....2..3..1

Crossrefs

Cf. A183802.

Sequence in context: A267950 A268097 A169595 * A367766 A336440 A368298

Adjacent sequences: A183790 A183791 A183792 * A183794 A183795 A183796

Keyword

nonn

Author

R. H. Hardin, Jan 07 2011

Status

approved