A266683 Number of 4Xn arrays containing n copies of 0..4-1 with no element 1 greater than its northwest or northeast neighbor modulo 4 and the upper left element equal to 0.

6, 101, 2520, 77830, 2643025, 96489721, 3689693411, 146213224799, 5947278854261, 246989317561499, 10427536481704470, 446242967428521164, 19312763398154267341, 843835503392824253913, 37171868113841641865335

Offset

1,1

Comments

Row 4 of A266681.

Links

R. H. Hardin, Table of n, a(n) for n = 1..16

Example

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

Crossrefs

Cf. A266681.

Sequence in context: A196693 A196726 A197066 * A196960 A218462 A065990

Adjacent sequences: A266680 A266681 A266682 * A266684 A266685 A266686

Keyword

nonn

Author

R. H. Hardin, Jan 02 2016

Status

approved