A209093 Number of n X n 0..2 arrays with new values 0..2 introduced in row major order and no element equal to more than one of its immediate leftward or upward or right-upward antidiagonal neighbors.

1, 11, 1326, 849548, 2896732704, 52675800891748, 5112092569118325704, 2648032740541890194825808, 7321189749687647765176559002512, 108035622217854017447945402727365754008

Offset

1,2

Comments

Diagonal of A209100.

Links

R. H. Hardin, Table of n, a(n) for n = 1..13

Example

Some solutions for n=4
..0..1..0..2....0..0..0..0....0..0..0..1....0..0..0..0....0..0..0..1
..1..2..0..1....1..1..1..0....2..1..2..0....1..1..1..0....1..1..2..0
..1..0..1..2....2..2..1..2....0..2..1..1....0..2..0..2....0..1..2..2
..0..1..2..0....0..0..2..0....2..0..0..1....2..0..1..1....0..0..0..2

Crossrefs

Cf. A209100.

Sequence in context: A182553 A340293 A223039 * A078274 A013716 A110195

Adjacent sequences: A209090 A209091 A209092 * A209094 A209095 A209096

Keyword

nonn

Author

R. H. Hardin, Mar 05 2012

Status

approved