Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1110-0111-0100 pattern in any orientation.
A146736
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1110-0111-0100 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =5a(7) =19a(8) =45a(9) =71a(10) =181a(11) =579a(12) =2359a(13) =9473a(14) =49633a(15) =219719a(16) =1381673a(17) =7390193a(18) =56382323a(19) =390282737a(20) =3729442205a(21) =31973256841
External references
- oeis: A146736