A222675 Number of nX4 0..3 arrays with no more than floor(nX4/2) elements unequal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..3 order.
4, 10, 58, 527, 8276, 133028, 2363628, 40206464, 727306856, 12525102179, 225526086320, 3916711645116, 70238669794180, 1227292294581568, 21942415435228510, 385251466640023275, 6872913615981792520
Offset: 1
Keywords
Examples
Some solutions for n=3 ..0..0..0..0....0..1..1..1....0..0..0..1....0..0..1..2....0..0..0..0 ..0..0..0..0....0..1..1..1....0..0..0..1....0..0..0..0....0..0..0..0 ..1..1..0..0....2..1..1..1....0..0..0..2....0..0..0..0....0..0..1..2
Links
- R. H. Hardin, Table of n, a(n) for n = 1..87
Comments