A231135 Number of (n+1)X(4+1) black-square subarrays of 0..2 arrays with no element equal to a strict majority of its diagonal and antidiagonal neighbors, with values 0..2 introduced in row major order

16, 182, 2260, 27171, 336004, 4066129, 50257244, 608468617, 7520563372, 91054483047, 1125418461348, 13625913937795, 168414092245220, 2039060342079409, 25202456511185596, 305136757252909097

Offset

1,1

Comments

Column 4 of A231137

Links

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

Formula

Empirical: a(n) = 175*a(n-2) -4017*a(n-4) +34311*a(n-6) -146236*a(n-8) +322472*a(n-10) -291040*a(n-12) +116032*a(n-14) -24064*a(n-16) +1024*a(n-18)

Example

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

Crossrefs

Sequence in context: A199018 A204608 A279282 * A230992 A016298 A288720

Adjacent sequences: A231132 A231133 A231134 * A231136 A231137 A231138

Keyword

nonn

Author

R. H. Hardin, Nov 04 2013

Status

approved