

A221397


Number of n X 3 arrays of occupancy after each element moves to some horizontal, diagonal or antidiagonal neighbor, with no 2loops and with no occupancy greater than 2.


1



0, 6, 30, 144, 672, 3108, 14328, 65976, 303672, 1397520, 6431136, 29594352, 136184256, 626677152, 2883768672, 13270180608, 61065117312, 281002082880, 1293081432192, 5950345861248, 27381582408576, 126001256419584
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