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A145859 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in two by two blocks. 0

%I #3 Mar 31 2012 12:35:08

%S 1,2,1,2,2,7,5,38,12,182,72,1536,513,21327,4531,360939,68662,9098657,

%T 1429824,345351393,40840428,18058986880,1747979822,1362075540043,

%U 106711196102,149443289019658,9237029528023,23324890541218597

%N Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in two by two blocks.

%e Maximal 7 X 7 example

%e .0.0.0.0.0.0.0

%e .1.1.0.0.0.1.1

%e .1.1.0.0.0.1.1

%e .0.0.0.0.0.0.0

%e .1.1.0.0.0.1.1

%e .1.1.0.0.0.1.1

%e .0.0.0.0.0.0.0

%K nonn

%O 1,2

%A _R. H. Hardin_, Oct 22 2008

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Last modified March 29 06:44 EDT 2024. Contains 371265 sequences. (Running on oeis4.)