A218312 Hilltop maps: number of n X n binary arrays indicating the locations of corresponding elements not exceeded by any king-move neighbor in a random 0..2 n X n array

1, 15, 511, 65089, 33296833, 68184176641, 558512367132769, 18299400300282885215

Offset

1,2

Comments

Diagonal of A218319.

Links

Table of n, a(n) for n=1..8.

Example

Some solutions for n=3:
..0..0..1....1..1..0....0..0..0....1..0..1....1..1..1....1..1..1....1..0..0
..1..1..1....0..1..1....0..1..1....0..1..1....0..0..0....1..0..1....0..1..0
..0..0..1....0..0..0....0..0..1....1..1..0....0..1..1....1..1..1....1..1..0

Crossrefs

Sequence in context: A218365 A203326 A092561 * A218280 A218632 A218235

Adjacent sequences: A218309 A218310 A218311 * A218313 A218314 A218315

Keyword

nonn

Author

R. H. Hardin, Oct 25 2012

Status

approved