Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 00100-00100-11111 pattern in any orientation.
A146999
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 00100-00100-11111 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =2a(7) =3a(8) =5a(9) =7a(10) =13a(11) =19a(12) =53a(13) =121a(14) =389a(15) =940a(16) =3064a(17) =7695a(18) =29728a(19) =97515a(20) =493327a(21) =1920641a(22) =10778992a(23) =46183271a(24) =290012194a(25) =1476840183a(26) =11445253811
External references
- oeis: A146999