A218419 Hilltop maps: number of n X n binary arrays indicating the locations of corresponding elements not exceeded by any horizontal, vertical or antidiagonal neighbor in a random 0..1 n X n array

1, 13, 357, 41515, 19003811, 34328798853, 245489633250861, 6942897327251230265, 776657742366634012014603, 343639983448734808976866431015, 601395784904377113605427806277106571

Offset

1,2

Comments

Diagonal of A218426

Links

R. H. Hardin, Table of n, a(n) for n = 1..12

Example

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

Crossrefs

Sequence in context: A297070 A220636 A078738 * A165391 A061015 A330255

Adjacent sequences: A218416 A218417 A218418 * A218420 A218421 A218422

Keyword

nonn

Author

R. H. Hardin Oct 28 2012

Status

approved