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A068240
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1/2 the number of colorings of a 4 X 4 square array with n colors.
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0
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1, 3906, 3000366, 414425080, 19064362455, 428429377026, 5861180425996, 55823546748096, 403783634784285, 2353615149832210, 11531349080992026, 48981767072238936, 184656623163700051, 629125059062885490
(list; graph; refs; listen; history; internal format)
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