Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1001-1111 pattern in any orientation.
A146620
Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1001-1111 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =5a(6) =1a(7) =13a(8) =13a(9) =77a(10) =73a(11) =597a(12) =385a(13) =9569a(14) =4155a(15) =164139a(16) =53517a(17) =3530729a(18) =1280671a(19) =136089779a(20) =42489917a(21) =6885316541a(22) =1853052759a(23) =545054905807a(24) =122748998951
External references
- oeis: A146620