A218315 Hilltop maps: number of nX4 binary arrays indicating the locations of corresponding elements not exceeded by any king-move neighbor in a random 0..2 nX4 array

13, 249, 4081, 65089, 1040977, 16654561, 266461045, 4263157633, 68206942353, 1091253912337, 17459148261297, 279331743809857, 4469073858100989, 71501437236882745, 1143963087047946337, 18302450903099098801

Offset

1,1

Comments

Column 4 of A218319

Links

R. H. Hardin, Table of n, a(n) for n = 1..144

Formula

Empirical: a(n) = 14*a(n-1) +28*a(n-2) +55*a(n-3) +122*a(n-4) +292*a(n-5) -40*a(n-6) -66*a(n-7) -40*a(n-9) -118*a(n-10) +13*a(n-12) +13*a(n-15)

Example

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

Crossrefs

Sequence in context: A053100 A320308 A219059 * A183416 A126422 A286878

Adjacent sequences: A218312 A218313 A218314 * A218316 A218317 A218318

Keyword

nonn

Author

R. H. Hardin Oct 25 2012

Status

approved