1/6 of the number of 6-colorings of an n X n array symmetric under 180 degree rotation.

A145247

1/6 of the number of 6-colorings of an n X n array symmetric under 180 degree rotation.

Terms

    a(0) =1a(1) =5a(2) =445a(3) =38945a(4) =61129245a(5) =94304065705

External references