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A218641
Hilltop maps: number of 6Xn binary arrays indicating the locations of corresponding elements not exceeded by any horizontal, diagonal or antidiagonal neighbor in a random 0..3 6Xn array
0
1, 4001, 261505, 16773633, 1073490145, 68702054721, 4396923919617, 281403077821441, 18009795930773137, 1152626873213807201, 73768115566393606785, 4721159119167361543169, 302154165890141908970689
OFFSET
1,2
COMMENTS
Row 6 of A218638
EXAMPLE
Some solutions for n=3
..0..1..0....0..0..1....0..1..0....0..1..0....0..0..0....0..0..1....0..0..1
..1..0..0....0..0..1....0..1..0....0..1..0....1..1..0....1..1..0....1..1..0
..1..0..0....0..1..0....1..0..0....1..0..0....1..0..0....0..0..0....1..0..1
..0..0..1....1..1..1....1..1..0....1..1..1....0..0..0....1..0..1....1..1..0
..0..0..0....1..0..1....0..0..0....0..0..1....0..0..0....0..1..0....0..1..1
..0..0..1....1..1..0....1..1..1....0..1..0....1..1..1....1..0..0....1..1..1
CROSSREFS
Sequence in context: A045262 A203088 A061700 * A092722 A034306 A228579
KEYWORD
nonn
AUTHOR
R. H. Hardin Nov 03 2012
STATUS
approved