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A193269
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Number of n X n symmetric 0..3 arrays with no element equal to any horizontal or vertical neighbor and with new values 0..3 introduced in lower triangular row major order
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1
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1, 2, 32, 1544, 176621, 47206184, 29472402866, 42983827798496, 146444618198769125, 1165528963636440929600, 21669813287735290595660642, 941174635410204103533009279920, 95492317441878732465782043745326917
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OFFSET
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1,2
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LINKS
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EXAMPLE
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Some solutions for 4X4
..0..1..2..1....0..1..0..3....0..1..2..3....0..1..0..3....0..1..2..3
..1..0..3..0....1..2..3..0....1..0..3..1....1..0..1..2....1..2..3..2
..2..3..0..2....0..3..2..1....2..3..2..0....0..1..2..3....2..3..1..3
..1..0..2..3....3..0..1..2....3..1..0..1....3..2..3..2....3..2..3..0
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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