A233219 Number of 3Xn 0..5 arrays with no element x(i,j) adjacent to value 5-x(i,j) horizontally or antidiagonally, top left element zero, and 1 appearing before 2 3 and 4, and 2 appearing before 3 in row major order

11, 452, 35446, 3054973, 268289572, 23644611625, 2085188355031, 183912477980908, 16221346021645357, 1430752109958104260, 126195026132569335016, 11130640168352123713243, 981743557172626207811542

Offset

1,1

Comments

Row 3 of A233217

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Formula

Empirical: a(n) = 111*a(n-1) -2128*a(n-2) +10532*a(n-3) -17559*a(n-4) +9045*a(n-5) for n>7

Example

Some solutions for n=3
..0..1..0....0..1..0....0..1..5....0..1..1....0..1..2....0..1..2....0..1..2
..0..2..1....5..1..0....2..4..2....1..0..2....3..5..1....5..5..5....1..1..0
..4..0..4....2..2..0....0..0..0....2..1..1....1..1..0....3..3..5....1..1..3

Crossrefs

Sequence in context: A360066 A354439 A180087 * A288685 A068235 A247598

Adjacent sequences: A233216 A233217 A233218 * A233220 A233221 A233222

Keyword

nonn

Author

R. H. Hardin, Dec 06 2013

Status

approved