A269648 Number of 4Xn arrays containing n copies of 0..4-1 avoiding the pattern down-up in every row and equal-up in every column.

24, 1880, 68876, 2316638, 94747953, 4581555620, 234861499280, 12266888439720, 650084333233220

Offset

1,1

Comments

Row 4 of A269646.

Links

Table of n, a(n) for n=1..9.

Example

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

Crossrefs

Cf. A269646.

Sequence in context: A222999 A166788 A123794 * A269338 A003738 A006685

Adjacent sequences: A269645 A269646 A269647 * A269649 A269650 A269651

Keyword

nonn

Author

R. H. Hardin, Mar 02 2016

Status

approved