A265174 Number of nX2 0..n*2-1 arrays with upper left zero and lower right n*2-1 and each element differing from its horizontal and vertical neighbors by a power of two.

1, 4, 21, 139, 8463, 219995, 6639203, 149441692, 6260685646, 183876714594, 6508183174645, 200502557111619, 7365189521794194, 232750786457812689, 7646516518149412694, 242109459701672908262, 12925753804930923765113

Offset

1,2

Comments

Column 2 of A265178.

Links

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

Example

Some solutions for n=4
..0..4....0..2....0..1....0..2....0..1....0..4....0..2....0..1....0..4....0..1
..1..5....2..6....1..5....2..3....4..5....1..2....2..4....4..5....4..5....4..2
..2..6....6..5....2..3....4..5....5..6....5..6....4..6....2..3....5..3....5..3
..3..7....5..7....3..7....3..7....3..7....3..7....6..7....3..7....6..7....6..7

Crossrefs

Cf. A265178.

Sequence in context: A349534 A222058 A379171 * A087761 A245503 A120368

Adjacent sequences: A265171 A265172 A265173 * A265175 A265176 A265177

Keyword

nonn

Author

R. H. Hardin, Dec 03 2015

Status

approved