A208169 Number of n X n 0..3 arrays with new values 0..3 introduced in row major order and no element equal to more than one of its immediate leftward or upward neighbors

1, 13, 8469, 99752346, 16567902881244, 38625516979536823947, 1263976383376771173195964686, 580579239138791881884932674640711196, 3743190521310525744113304412007474906812935048

Offset

1,2

Comments

Diagonal of A208175

Links

R. H. Hardin, Table of n, a(n) for n = 1..10

Example

Some solutions for n=4
..0..0..0..0....0..0..0..1....0..1..0..0....0..0..0..1....0..0..0..0
..0..1..1..2....1..1..0..0....2..2..1..2....1..0..1..2....1..1..1..1
..1..0..1..3....2..3..3..0....1..1..3..2....2..2..1..0....2..1..2..3
..1..3..3..1....0..2..1..3....0..3..0..0....0..3..0..1....0..1..2..0

Crossrefs

Sequence in context: A013524 A060887 A020521 * A205162 A122429 A173506

Adjacent sequences: A208166 A208167 A208168 * A208170 A208171 A208172

Keyword

nonn

Author

R. H. Hardin Feb 24 2012

Status

approved