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

Author

R. H. Hardin Oct 28 2012

Keywords

• nonn

Comments

Diagonal of A218426

Examples

			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
		

Links

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