Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1100-1100-0111 pattern in any orientation.

A146694

Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1100-1100-0111 pattern in any orientation.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =3a(8) =9a(9) =19a(10) =37a(11) =103a(12) =317a(13) =831a(14) =2581a(15) =12105a(16) =62053a(17) =307133a(18) =1586103a(19) =9856867a(20) =66841097a(21) =477861431

External references