Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1000-1000-1100-0111 pattern in any orientation.
A147103
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1000-1000-1100-0111 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =3a(5) =3a(6) =7a(7) =7a(8) =33a(9) =45a(10) =155a(11) =235a(12) =1041a(13) =1865a(14) =10449a(15) =21963a(16) =145411a(17) =358505a(18) =2858721a(19) =8246787a(20) =73843755a(21) =250514431a(22) =2686708159a(23) =10696190873a(24) =134925870103a(25) =635649150983
External references
- oeis: A147103