A218192 Hilltop maps: number of nX4 binary arrays indicating the locations of corresponding elements not exceeded by any horizontal or vertical neighbor in a random 0..3 nX4 array

15, 251, 4067, 65251, 1044001, 16703113, 267240217, 4275711525, 68409381991, 1094518209251, 17511781134639, 280180333840835, 4482754713004137, 71721985406792741, 1147518327444638505, 18359758229692585737

Offset

1,1

Comments

Column 4 of A218196

Links

R. H. Hardin, Table of n, a(n) for n = 1..153

Example

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

Crossrefs

Sequence in context: A285395 A331493 A093147 * A066410 A370317 A116508

Adjacent sequences: A218189 A218190 A218191 * A218193 A218194 A218195

Keyword

nonn

Author

R. H. Hardin Oct 23 2012

Status

approved