A222943 Number of nX5 0..4 arrays with no element equal to another at a city block distance of exactly two, and new values 0..4 introduced in row major order

20, 2433, 82320, 2883000, 100692120, 3510873720, 122511965400, 4273149243000, 149059992633720, 5199524649003000, 181370629635282360, 6326611100912309880, 220686102418837715640, 7698019468039834665720, 268523926123551652847160

Offset

1,1

Comments

Column 5 of A222944

Links

R. H. Hardin, Table of n, a(n) for n = 1..173

Formula

Empirical: a(n) = 39*a(n-1) -5650*a(n-3) +4996*a(n-4) +682880*a(n-5) -2308736*a(n-6) -18242688*a(n-7) +99488000*a(n-8) -77840384*a(n-9) -886554624*a(n-10) +2941747200*a(n-11) +736690176*a(n-12) -9720299520*a(n-13) +28991029248*a(n-15) -21743271936*a(n-16) for n>18

Example

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

Crossrefs

Sequence in context: A305658 A329067 A064878 * A222750 A250019 A145405

Adjacent sequences: A222940 A222941 A222942 * A222944 A222945 A222946

Keyword

nonn

Author

R. H. Hardin Mar 09 2013

Status

approved