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A222881
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Number of 4Xn 0..3 arrays with no more than floor(4Xn/2) elements equal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..3 order
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1
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15, 2150, 443510, 95867967, 20978414941, 4643150795564, 1036481888251762, 232912437941917635, 52614561200004212957, 11936312777288007185980, 2717468404561524996790251, 620503805193057253513443782
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