A203873 Number of (n+1)X4 0..3 arrays with no 2X2 subblock having equal diagonal elements or equal antidiagonal elements, and new values 0..3 introduced in row major order

487, 23815, 1166887, 57177415, 2801693287, 137282971015, 6726865579687, 329616413404615, 16151204256826087, 791409008584478215, 38779041420639432487, 1900173029611332191815, 93108478450955277398887

Offset

1,1

Comments

Column 3 of A203878

Links

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

Formula

Empirical: a(n) = 486*49^(n-1) +1

Example

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

Crossrefs

Sequence in context: A255207 A236424 A235839 * A097766 A214806 A126819

Adjacent sequences: A203870 A203871 A203872 * A203874 A203875 A203876

Keyword

nonn

Author

R. H. Hardin Jan 07 2012

Status

approved