Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0010-1010-1111 pattern in any orientation.
A146779
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0010-1010-1111 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =3a(8) =5a(9) =15a(10) =25a(11) =43a(12) =101a(13) =369a(14) =1113a(15) =5539a(16) =16529a(17) =75239a(18) =298319a(19) =1804759a(20) =9458781a(21) =72980139
External references
- oeis: A146779