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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. 1
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

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

CROSSREFS

Cf. A266867.

Sequence in context: A214875 A047058 A202382 * A001763 A003235 A113133

Adjacent sequences:  A266866 A266867 A266868 * A266870 A266871 A266872

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 04 2016

STATUS

approved

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Last modified January 15 10:37 EST 2021. Contains 340187 sequences. (Running on oeis4.)