A222841 Number of n X 4 0..3 arrays with no more than floor(n X 4/2) elements equal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..3 order.

11, 1585, 326408, 70144361, 15371324917, 3410802057085, 763478480305913, 172013012570239087, 38951066890039501260, 8855947103673731502351, 2020193746874015711217978, 462122926444094400382307495

Offset: 1

Author

R. H. Hardin Mar 06 2013

Keywords

• nonn

Comments

Column 4 of A222842.

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..20

Crossrefs

Cf. A222842.