A222271 Number of nX3 0..3 arrays with exactly floor(nX3/2) elements unequal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..3 order

0, 4, 4, 81, 364, 5996, 27980, 507909, 2380692, 44501178, 208717216, 3948025953, 18510211252, 352744650956, 1653908717680, 31689827693324, 148654828631998, 2860214905912758, 13427178703144724, 259196177077920492

Offset

1,2

Comments

Column 3 of A222275

Links

R. H. Hardin, Table of n, a(n) for n = 1..125

Example

All solutions for n=3
..0..0..0....0..0..0....0..1..0....0..0..0
..0..0..1....0..0..0....0..0..0....1..0..0
..0..0..0....0..1..0....0..0..0....0..0..0

Crossrefs

Sequence in context: A327303 A337302 A351349 * A068376 A131592 A317868

Adjacent sequences: A222268 A222269 A222270 * A222272 A222273 A222274

Keyword

nonn

Author

R. H. Hardin Feb 14 2013

Status

approved