Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1101-1111 pattern in any orientation.
A146869
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1101-1111 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =9a(7) =29a(8) =49a(9) =117a(10) =309a(11) =1103a(12) =4069a(13) =20291a(14) =72247a(15) =389841a(16) =1904157a(17) =13920727a(18) =88083783a(19) =777496329a(20) =5560593885a(21) =59069816813
External references
- oeis: A146869