A218419 - OEIS

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

(list; graph; refs; listen; history; text; internal format)

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