Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1101-0111-0010 pattern in any orientation.

A147241

Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1101-0111-0010 pattern in any orientation.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =17a(9) =17a(10) =57a(11) =57a(12) =413a(13) =413a(14) =5775a(15) =5775a(16) =129385a(17) =129385a(18) =3828429a(19) =3828429a(20) =165279073a(21) =165279073

External references