

A209954


Number of (n+1)X3 0..2 arrays with every 2X2 subblock having one, three or four distinct clockwise edge differences


1



567, 12161, 260201, 5569307, 119198607, 2551206049, 54603359537, 1168673933963, 25013090104279, 535354363340225, 11458172261417433, 245238893701357211, 5248840184974455807, 112340758338207683457, 2404425652140227799457
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OFFSET

1,1


COMMENTS



LINKS



FORMULA

Empirical: a(n) = 24*a(n1) 23*a(n2) 678*a(n3) 472*a(n4) +1196*a(n5) +448*a(n6) 416*a(n7)


EXAMPLE

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


CROSSREFS



KEYWORD

nonn


AUTHOR



STATUS

approved



