Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1100-0100-0111 pattern in any orientation.
A146441
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1100-0100-0111 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) =39a(11) =119a(12) =357a(13) =921a(14) =3063a(15) =15421a(16) =82217a(17) =416323a(18) =2370803a(19) =16101191a(20) =113312875a(21) =843888839a(22) =7373458463a(23) =76576709025
External references
- oeis: A146441