Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1010-1111 pattern in any orientation.
A146425
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1010-1111 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =3a(7) =7a(8) =15a(9) =27a(10) =47a(11) =145a(12) =629a(13) =2639a(14) =10689a(15) =40727a(16) =200517a(17) =1226295a(18) =9011761a(19) =67694903a(20) =542738577a(21) =4721537297a(22) =50165476303a(23) =597630948157
External references
- oeis: A146425