A217269 Number of n X 4 arrays of occupancy after each element moves to some horizontal or vertical neighbor.

4, 441, 33856, 2572816, 194881600, 14755689729, 1117092569476, 84567501131481, 6401965110822961, 484642857129680209, 36688499987102073289, 2777397165745966328049, 210254833741528740686404

Offset

1,1

Comments

Column 4 of A217273.

Links

R. H. Hardin, Table of n, a(n) for n = 1..38

Formula

Empirical: a(n) = 102*a(n-1) -2037*a(n-2) +2098*a(n-3) +111987*a(n-4) -459828*a(n-5) -54016*a(n-6) +1828299*a(n-7) -2079066*a(n-8) +455875*a(n-9) +352710*a(n-10) -165978*a(n-11) +15218*a(n-12) +1308*a(n-13) -111*a(n-14) +a(n-15).

Example

Some solutions for n=3
..0..1..0..0....1..1..0..2....1..3..1..1....1..0..0..1....1..2..2..1
..1..1..3..2....1..1..2..1....0..2..1..0....1..2..0..3....2..0..0..1
..2..0..1..1....2..0..1..0....0..1..2..0....0..3..0..1....2..0..0..1

Crossrefs

Cf. A217273.

Sequence in context: A125760 A053780 A159514 * A034985 A262102 A104690

Adjacent sequences: A217266 A217267 A217268 * A217270 A217271 A217272

Keyword

nonn

Author

R. H. Hardin Sep 29 2012

Status

approved