A186163 - OEIS

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A186163

1/4 the number of nX4 0..3 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors

4, 321, 14364, 751266, 37402872, 1899336597, 95752776009, 4840082975532, 244420512852030, 12347377339339755, 623671780419814416, 31503432697236966789, 1591300459563274835532, 80380228276030331585859

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

OFFSET

1,1

COMMENTS

Column 4 of A186168

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..200

EXAMPLE

Some solutions for 6X4 with a(1,1)=0

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

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

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