Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1010-1111-0101 pattern in any orientation.
A147432
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1010-1111-0101 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) =7a(10) =13a(11) =21a(12) =39a(13) =91a(14) =251a(15) =693a(16) =2197a(17) =6837a(18) =23871a(19) =89603a(20) =379705a(21) =1672695a(22) =8302957a(23) =42265243a(24) =244734851a(25) =1469763313
External references
- oeis: A147432