A231127 Number of (n+1)X(4+1) white-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, 176, 2260, 27664, 336004, 4150352, 50257244, 621150768, 7520563372, 92952785328, 1125418461348, 13909988936720, 168414092245220, 2081570967982416, 25202456511185596, 311498292593207728

Offset

1,1

Comments

Column 4 of A231131

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
..0..x..1..x..2....0..x..1..x..2....0..x..0..x..0....0..x..1..x..2
..x..1..x..0..x....x..2..x..0..x....x..1..x..2..x....x..2..x..0..x
..0..x..0..x..2....0..x..1..x..2....2..x..0..x..2....0..x..1..x..2
..x..1..x..0..x....x..1..x..2..x....x..1..x..0..x....x..2..x..1..x
..0..x..0..x..2....2..x..1..x..1....2..x..2..x..2....1..x..0..x..0

Crossrefs

Sequence in context: A268459 A070030 A283278 * A007144 A017521 A323856

Adjacent sequences: A231124 A231125 A231126 * A231128 A231129 A231130

Keyword

nonn

Author

R. H. Hardin, Nov 04 2013

Status

approved