Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0100-1100-1111 pattern in any orientation.
A146787
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0100-1100-1111 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =3a(7) =5a(8) =11a(9) =21a(10) =39a(11) =105a(12) =351a(13) =1205a(14) =4629a(15) =16631a(16) =70563a(17) =335933a(18) =1961161a(19) =12194507a(20) =84627809a(21) =599408761
External references
- oeis: A146787