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Row sums of A261242: number of connected binary bisymmetric n X n matrices B with B[1,1] = 1 = B[2,2].
1

%I #11 Sep 16 2015 04:54:21

%S 1,1,3,9,58,384

%N Row sums of A261242: number of connected binary bisymmetric n X n matrices B with B[1,1] = 1 = B[2,2].

%C For the definition of a connected binary bisymmetric n X n matrix B with the four corners occupied by 1s see the comment under A261242.

%Y Cf. A261242.

%K nonn,more

%O 1,3

%A _Wolfdieter Lang_ and _Kival Ngaokrajang_, Aug 18 2015