A204073 Number of (n+1)X6 0..2 arrays with every 2X2 subblock having equal diagonal elements or equal antidiagonal elements, and new values 0..2 introduced in row major order

4688, 221726, 11081828, 563880962, 28864215128, 1480470688070, 75985220860460, 3900809853901802, 200268432775804640, 10282077911857180910, 527901424170345081716, 27103536327800063656274, 1391552121866875493481704

Offset

1,1

Comments

Column 5 of A204076

Links

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

Formula

Empirical: a(n) = 78*a(n-1) -1521*a(n-2) +7304*a(n-3) +32884*a(n-4) -338760*a(n-5) +639312*a(n-6) +947424*a(n-7) -3942080*a(n-8) +2598528*a(n-9) +1739776*a(n-10) -1832448*a(n-11) -14336*a(n-12) +163840*a(n-13)

Example

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

Crossrefs

Sequence in context: A263066 A252773 A368192 * A256808 A114542 A114568

Adjacent sequences: A204070 A204071 A204072 * A204074 A204075 A204076

Keyword

nonn

Author

R. H. Hardin Jan 10 2012

Status

approved