A218370 Hilltop maps: number of n X 6 binary arrays indicating the locations of corresponding elements not exceeded by any horizontal, vertical or antidiagonal neighbor in a random 0..3 n X 6 array.

57, 4033, 261121, 16744435, 1071613317, 68583014753, 4389308736641, 280915626315891, 17978591986163097, 1150629370448189409, 73640246650330923779, 4712973669728804088699, 301630179445484189338797

Offset

1,1

Comments

Column 6 of A218372.

Links

R. H. Hardin, Table of n, a(n) for n = 1..23

Example

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

Crossrefs

Cf. A218372.

Sequence in context: A015259 A218808 A218194 * A218636 A218240 A281567

Adjacent sequences: A218367 A218368 A218369 * A218371 A218372 A218373

Keyword

nonn

Author

R. H. Hardin, Oct 27 2012

Status

approved