A218637 Hilltop maps: number of nX7 binary arrays indicating the locations of corresponding elements not exceeded by any horizontal, diagonal or antidiagonal neighbor in a random 0..3 nX7 array

113, 16257, 2096129, 268375113, 34351030657, 4396923919617, 562806164441653, 72039179359935185, 9221013924842933937, 1180289649641919709529, 151077058155294314735841, 19337861267846477086600769

Offset

1,1

Comments

Column 7 of A218638

Links

R. H. Hardin, Table of n, a(n) for n = 1..33

Example

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

Crossrefs

Sequence in context: A218809 A218195 A218371 * A218241 A152496 A176825

Adjacent sequences: A218634 A218635 A218636 * A218638 A218639 A218640

Keyword

nonn

Author

R. H. Hardin Nov 03 2012

Status

approved