A265488 Number of (3n-2)X2 0..6n-5 arrays with upper left zero and lower right 6n-5 and each element differing from its horizontal, vertical and diagonal neighbors by a power of two.

1, 12, 1030, 298764, 83948008, 22511356876, 10087240306899, 3527678938392395, 1384849739444093464, 509526476766763110063, 197694082692466208850553, 132949897804861666617140704, 58944850608913545191419115404

Offset

1,2

Comments

Column 2 of A265494 (terms of the form 3n-2).

Links

R. H. Hardin, Table of n, a(n) for n = 1..70

Example

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

Crossrefs

Cf. A265494.

Sequence in context: A123283 A272855 A365571 * A232912 A004812 A088671

Adjacent sequences: A265485 A265486 A265487 * A265489 A265490 A265491

Keyword

nonn

Author

R. H. Hardin, Dec 09 2015

Status

approved