Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 2X4 tee 1,1 1,2 1,3 2,3 1,4 in any orientation.
A146042
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 2X4 tee 1,1 1,2 1,3 2,3 1,4 in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =3a(6) =5a(7) =11a(8) =21a(9) =41a(10) =165a(11) =701a(12) =2953a(13) =12345a(14) =51325a(15) =344201a(16) =2572877a(17) =21631323a(18) =180106811a(19) =1718811817a(20) =19639803327a(21) =281005626019
External references
- oeis: A146042