Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 11000-01110-00011 pattern in any orientation.
A147189
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 11000-01110-00011 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) =11a(11) =19a(12) =53a(13) =119a(14) =315a(15) =741a(16) =2791a(17) =8507a(18) =37441a(19) =131241a(20) =690373a(21) =2947311a(22) =17685311a(23) =87080583a(24) =622517947a(25) =3695889011a(26) =31549600531
External references
- oeis: A147189