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A209087
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Number of n X 3 0..3 arrays avoiding the pattern z z+1 z horizontally and z z-1 z vertically.
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1
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61, 3721, 196916, 10347649, 544875737, 28698007940, 1511450744648, 79603803814415, 4192507425158897, 220807551277341423, 11629311263707252062, 612483037985935327094, 32257754889454936954747, 1698925008894729788416226
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