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

1,1

Comments

Column 2 of A203491.

Links

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

Example

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

Crossrefs

Cf. A203491.

Sequence in context: A167330 A025629 A068889 * A221519 A332984 A038264

Adjacent sequences: A203482 A203483 A203484 * A203486 A203487 A203488

Keyword

nonn

Author

R. H. Hardin, Jan 02 2012

Status

approved