A233226 Number of nX4 0..5 arrays with no element x(i,j) adjacent to value 5-x(i,j) horizontally, diagonally, antidiagonally or vertically, top left element zero, and 1 appearing before 2 3 and 4, and 2 appearing before 3 in row major order.

23, 2541, 420948, 72049266, 12389989684, 2131764323784, 366805442634477, 63115455429961173, 10860156414181066717, 1868686679256045815893, 321541405170806242604768, 55327025424814353393541818

Offset

1,1

Comments

Column 4 of A233230

Links

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

Formula

Empirical: a(n) = 208*a(n-1) -6194*a(n-2) -6657*a(n-3) +1510366*a(n-4) -4909922*a(n-5) -83197258*a(n-6) +434631988*a(n-7) +327946201*a(n-8) -4201117068*a(n-9) +1899947531*a(n-10) +14849526767*a(n-11) -12775127323*a(n-12) -22240589415*a(n-13) +23935227067*a(n-14) +13900628187*a(n-15) -18073202257*a(n-16) -2644553309*a(n-17) +5223316598*a(n-18) -76874653*a(n-19) -517583738*a(n-20) +40060322*a(n-21) +4525360*a(n-22) -152800*a(n-23)

Example

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

Crossrefs

Sequence in context: A068655 A336170 A232362 * A233446 A088385 A030461

Adjacent sequences: A233223 A233224 A233225 * A233227 A233228 A233229

Keyword

nonn

Author

R. H. Hardin, Dec 06 2013

Status

approved