A231435 Number of (n+2)X(2+2) 0..3 arrays with no element unequal to a strict majority of its horizontal, vertical, diagonal and antidiagonal neighbors, with values 0..3 introduced in row major order

2, 4, 8, 17, 45, 104, 280, 752, 2076, 5947, 17063, 50170, 148048, 440654, 1318362, 3954541, 11900191, 35855502, 108184920, 326687124, 987055180, 2983676881, 9021446161, 27283340688, 82523932704, 249635724500, 755206783160

Offset

1,1

Comments

Column 2 of A231441

Links

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

Formula

Empirical: a(n) = 5*a(n-1) -24*a(n-3) -4*a(n-4) +70*a(n-5) +7*a(n-6) -29*a(n-7) -24*a(n-8) -202*a(n-9) +21*a(n-10) +269*a(n-11) +185*a(n-12) -177*a(n-13) -123*a(n-14) +5*a(n-15) -116*a(n-16) +144*a(n-17) +30*a(n-18) -36*a(n-19)

Example

Some solutions for n=6
..0..0..0..0....0..0..1..1....0..0..0..0....0..0..0..0....0..0..0..0
..0..0..0..0....0..0..1..1....0..0..0..0....0..0..0..0....0..0..0..0
..1..1..0..0....1..1..0..0....0..0..1..1....1..1..1..1....0..0..0..0
..1..1..1..1....1..1..0..0....0..1..1..1....1..1..1..1....0..0..0..0
..1..1..1..1....0..0..1..1....0..1..1..1....2..2..2..2....0..0..1..1
..1..1..1..1....0..0..1..1....0..0..1..1....2..2..2..2....1..1..1..1
..1..1..1..1....0..0..1..1....0..0..1..1....3..3..3..3....1..1..1..1
..1..1..1..1....0..0..1..1....0..0..1..1....3..3..3..3....1..1..1..1

Crossrefs

Sequence in context: A283162 A364210 A231221 * A113153 A372543 A255999

Adjacent sequences: A231432 A231433 A231434 * A231436 A231437 A231438

Keyword

nonn

Author

R. H. Hardin, Nov 09 2013

Status

approved