Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 101-111-101 pattern in any orientation.
A146433
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 101-111-101 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) =5a(10) =9a(11) =13a(12) =25a(13) =49a(14) =124a(15) =263a(16) =846a(17) =2209a(18) =7594a(19) =21663a(20) =81736a(21) =275021a(22) =1243671a(23) =4831201a(24) =26082779a(25) =118314435a(26) =731456697a(27) =3805948133a(28) =26532655113a(29) =159482402665
External references
- oeis: A146433