A203485 Number of n X 2 0..2 arrays with row sums equal and column sums unequal to adjacent columns.

6, 10, 36, 82, 256, 676, 2050, 5826, 17568, 51640, 155590, 463996, 1397766, 4192646, 12626836, 37955426, 114267376, 343694728, 1034313190, 3111132672, 9359196778, 28146901826, 84646727920, 254509346220, 765178882006, 2300166018706

Offset: 1

Author

R. H. Hardin, Jan 02 2012

Keywords

• nonn

Comments

Column 2 of A203491.

Examples

			Some solutions for n=5
..2..0....2..0....1..0....2..0....0..2....0..2....1..0....2..0....2..0....0..1
..1..1....0..2....0..1....2..0....2..0....1..1....0..1....1..1....1..1....0..1
..0..2....0..2....0..1....2..0....0..2....0..2....1..0....1..1....0..2....1..0
..2..0....0..2....0..1....2..0....0..2....0..2....0..1....0..2....2..0....0..1
..1..1....2..0....0..1....0..2....1..1....0..2....1..0....2..0....2..0....0..1
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210

Crossrefs

Cf. A203491.