A206168 Number of (n+1)X8 0..3 arrays with every 2X2 subblock in a row having an equal number of equal diagonal or equal antidiagonal elements, adjacent rows differing in this number, and new values 0..3 introduced in row major order.

3375401, 529805350, 440473683078, 69556988274126, 57870112115269814

Offset

1,1

Comments

Column 7 of A206169

Links

Table of n, a(n) for n=1..5.

Example

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

Crossrefs

Sequence in context: A257916 A015408 A036472 * A206382 A114682 A157106

Adjacent sequences: A206165 A206166 A206167 * A206169 A206170 A206171

Keyword

nonn

Author

R. H. Hardin, Feb 04 2012

Status

approved