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A155238
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Number of ways to place zero or more nonadjacent 1,0 1,1 2,0 3,0 4,1 polyhexes in any orientation on a planar nXnXn triangular grid.
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0
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1, 4, 13, 28, 125, 568, 3422, 27373, 226848, 2490002, 34395449, 564841115, 11835714950, 297683710781, 9228089921657
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