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A146155
Number of n X n binary arrays symmetric about main diagonal with all ones connected only either as two by three or three by two blocks.
+0
1
1, 1, 1, 1, 3, 7, 14, 42, 163, 719, 3628, 22263, 164206, 1435593, 15071126, 189778079, 2837151684, 50511089269, 1077365551719, 27499985838212, 837318042012350, 30417349994865723, 1319974251781005014, 68432608866087524550
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Maintained by
N. J. A. Sloane
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Last modified November 27 14:50 EST 2009. Contains 167570 sequences.
AT&T Labs Research
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