A218598 Hilltop maps: number of 7Xn binary arrays indicating the locations of corresponding elements not exceeded by any horizontal or antidiagonal neighbor in a random 0..2 7Xn array

1, 11011, 1782855, 227451273, 28782653703, 3663996495065, 467122877883141, 59564772010560679, 7594747878648617511, 968342656073731373915, 123465264778955860526245, 15742032324396343036237669

Offset

1,2

Comments

Row 7 of A218592

Links

R. H. Hardin, Table of n, a(n) for n = 1..21

Example

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

Crossrefs

Sequence in context: A181319 A267811 A267934 * A096930 A233720 A368697

Adjacent sequences: A218595 A218596 A218597 * A218599 A218600 A218601

Keyword

nonn

Author

R. H. Hardin Nov 03 2012

Status

approved