A219072 - OEIS

A219072

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

1, 11, 337, 32945, 14228041, 24734141495, 167024618548071, 4450580094888603089, 469651231165595918842913, 195869567064782965280559200707

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

OFFSET

1,2

COMMENTS

Diagonal of A219078

LINKS

Table of n, a(n) for n=1..10.

EXAMPLE

Some solutions for n=3

..0..1..1....0..0..1....1..1..0....1..0..1....0..0..1....1..1..0....1..1..0

..0..0..1....1..1..0....1..1..0....0..0..1....1..1..1....0..1..0....0..0..0

..1..1..0....0..1..1....0..1..1....1..1..1....1..1..0....0..0..1....1..0..1

CROSSREFS

Sequence in context: A206532 A106717 A215015 * A280669 A195505 A092609

Adjacent sequences: A219069 A219070 A219071 * A219073 A219074 A219075

KEYWORD

nonn

AUTHOR

R. H. Hardin Nov 11 2012

STATUS

approved