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A194888
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Number of lower triangles of an n X n 0..3 array with new values introduced in row major order 0..3 and no two horizontal or vertical neighbors of any element equal.
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1
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1, 3, 24, 192, 1152, 5760, 26880, 118272, 506880, 2119680, 8761344, 35807232, 145539072, 588349440, 2372075520, 9538240512, 38303170560, 153613762560, 615659864064, 2465854390272, 9873068654592, 39518019256320, 158149336104960
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