A218425 Hilltop maps: number of nX7 binary arrays indicating the locations of corresponding elements not exceeded by any horizontal, vertical or antidiagonal neighbor in a random 0..1 nX7 array.

57, 11011, 1207525, 144597047, 17270172871, 2058493362799, 245489633250861, 29274579482710357, 3490981608801331021, 416298960473587173025, 49643559085814354624329, 5919983699927241114279393

Offset: 1

Author

R. H. Hardin Oct 28 2012

Keywords

• nonn

Comments

Column 7 of A218426

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..83