A184555 Number of (n+1)X(n+1) 0..2 arrays with no 2X2 subblock summing to less than 4

50, 5736, 3436266, 12900566348, 276510402290782, 35245029137091490532, 26246732217663407375879655, 115019923806287297509943176811916, 2957519612846906106776158316962863659667

Offset

1,1

Comments

Diagonal of A184564

Links

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

Example

Some solutions for 3X3
..2..2..2....1..2..0....2..0..2....2..0..2....1..2..2....2..2..0....2..1..2
..2..2..2....2..1..1....1..2..2....1..2..1....2..1..1....2..1..2....2..2..2
..2..0..1....0..2..2....0..2..2....0..2..1....0..1..2....2..1..1....1..2..0

Crossrefs

Sequence in context: A230477 A320099 A115436 * A301992 A229753 A276102

Adjacent sequences: A184552 A184553 A184554 * A184556 A184557 A184558

Keyword

nonn

Author

R. H. Hardin Jan 17 2011

Status

approved