A209733 1/4 the number of (n+1)X6 0..3 arrays with every 2X2 subblock having distinct edge sums.

21976, 775096, 28927984, 1138541280, 45147495264, 1809791149768, 72515584004736, 2914488537817408, 117033599127615880, 4704742675739474176, 189030631236371886792, 7598451666243980931808, 305353336500744007552616

Offset: 1

Author

R. H. Hardin Mar 12 2012

Keywords

• nonn

Comments

Column 5 of A209736

Examples

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

Links

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