Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1000-1010-1111 pattern in any orientation.

A146811

Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1000-1010-1111 pattern in any orientation.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =3a(8) =7a(9) =15a(10) =31a(11) =65a(12) =179a(13) =483a(14) =1549a(15) =5893a(16) =23203a(17) =108809a(18) =513209a(19) =2742185a(20) =15938025a(21) =102500855

External references