Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1110-0111-0100 pattern in any orientation.
A146734
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1110-0111-0100 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) =33a(11) =65a(12) =207a(13) =775a(14) =3377a(15) =13307a(16) =53409a(17) =249201a(18) =1453605a(19) =9533963a(20) =70032903a(21) =523853865a(22) =4420682653
External references
- oeis: A146734