A261244 Row sums of A261242: number of connected binary bisymmetric n X n matrices B with B[1,1] = 1 = B[2,2].

1, 1, 3, 9, 58, 384

Offset

1,3

Comments

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.

Links

Table of n, a(n) for n=1..6.

Crossrefs

Cf. A261242.

Sequence in context: A192252 A363011 A105466 * A018504 A340389 A140812

Adjacent sequences: A261241 A261242 A261243 * A261245 A261246 A261247

Keyword

nonn,more

Author

Wolfdieter Lang and Kival Ngaokrajang, Aug 18 2015

Status

approved