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A145779 Number of n X n binary arrays symmetric under 90-degree rotation with all ones connected only either two adjacent vertically or two adjacent horizontally. 0

%I #5 Nov 25 2018 13:03:08

%S 1,1,1,4,8,17,58,224,939,4970,30996,225413,1970184,20575972,252185309,

%T 3690646219,64088665934,1323737025941,32350145726565,942783467265088,

%U 32507076170340916,1335377761740727698,64933573760903971267

%N Number of n X n binary arrays symmetric under 90-degree rotation with all ones connected only either two adjacent vertically or two adjacent horizontally.

%K nonn

%O 1,4

%A _R. H. Hardin_, Oct 18 2008

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Last modified March 29 06:57 EDT 2024. Contains 371265 sequences. (Running on oeis4.)