Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1000-1000-1111-0100 pattern in any orientation.

A147119

Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1000-1000-1111-0100 pattern in any orientation.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =3a(9) =9a(10) =19a(11) =33a(12) =79a(13) =209a(14) =671a(15) =2175a(16) =8279a(17) =34581a(18) =151497a(19) =746481a(20) =3938933a(21) =23401293

External references