Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 2X3 U in any orientation.
A146059
Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 2X3 U in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =3a(7) =1a(8) =5a(9) =1a(10) =11a(11) =5a(12) =41a(13) =13a(14) =189a(15) =31a(16) =927a(17) =133a(18) =5603a(19) =759a(20) =45359a(21) =5033a(22) =469791a(23) =38887a(24) =5816617a(25) =382421a(26) =90000163a(27) =4832387a(28) =1751237935a(29) =75700651
External references
- oeis: A146059