A218235 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..3 n X n array

1, 15, 511, 65535, 33552513, 68715299265, 562915602593793

Offset

1,2

Comments

Diagonal of A218242

Links

Table of n, a(n) for n=1..7.

Example

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

Crossrefs

Sequence in context: A218312 A218280 A218632 * A212739 A009068 A268960

Adjacent sequences: A218232 A218233 A218234 * A218236 A218237 A218238

Keyword

nonn

Author

R. H. Hardin Oct 24 2012

Status

approved