A266869 - OEIS

A266869

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

6, 72, 1304, 31501, 843874, 24244702, 728850883, 22663306978, 723210750621, 23536767146485, 778080992727147, 26055452315387786, 881920582298144042, 30122404974018012719, 1036868581470252969758, 35932758405637296245430

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

Row 4 of A266867.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..20

EXAMPLE

Some solutions for n=4

..0..0..2..0....0..3..2..2....0..3..1..1....0..2..0..0....0..0..2..0

..2..1..3..2....3..2..1..3....2..1..3..2....1..3..2..1....2..0..3..3

..1..1..1..0....1..1..1..0....3..2..2..0....3..2..1..1....2..1..3..2