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A146000
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Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 3X3 plus 2,1 2,2 2,3 1,2 3,2.
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0
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1, 1, 2, 3, 6, 13, 41, 134, 523, 2341, 13112, 85330, 657274, 5867785, 62935391, 796238629, 11963244988, 210625730574, 4398387347279, 108485411030401, 3172272297097957, 109373622124547205, 4459641160503515254
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