Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 2X4 el 1,1 1,2 1,3 1,4 2,4 with any orientation.
A146017
Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 2X4 el 1,1 1,2 1,3 1,4 2,4 with any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =29a(9) =29a(10) =297a(11) =297a(12) =3639a(13) =3639a(14) =84611a(15) =84611a(16) =2861167a(17) =2861167a(18) =210769267a(19) =210769267a(20) =22904472355a(21) =22904472355
External references
- oeis: A146017