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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
1, 4, 21, 139, 8463, 219995, 6639203, 149441692, 6260685646, 183876714594, 6508183174645, 200502557111619, 7365189521794194, 232750786457812689, 7646516518149412694, 242109459701672908262, 12925753804930923765113 (list; graph; refs; listen; history; text; internal format)
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: A180399 A349534 A222058 * A087761 A245503 A120368

Adjacent sequences:  A265171 A265172 A265173 * A265175 A265176 A265177

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 03 2015

STATUS

approved

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Last modified August 15 23:32 EDT 2022. Contains 356150 sequences. (Running on oeis4.)