A268120 - OEIS

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A268120

Number of 4Xn arrays containing n copies of 0..4-1 with every element equal to or 1 greater than any north or west neighbors modulo 4 and the upper left element equal to 0.

1, 2, 5, 25, 182, 1256, 7396, 39891, 210384, 1168317, 7080023, 45942141, 304138329, 1984289501, 12627984625, 79001714951, 493690545161, 3127108593615, 20194195021000, 132397182653318, 873218912983165, 5749093679423621

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

OFFSET

1,2

COMMENTS

Row 4 of A268115.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..34

EXAMPLE

Some solutions for n=6

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

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

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