Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1100-0100-0111-0001 pattern in any orientation.

A147197

Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1100-0100-0111-0001 pattern in any orientation.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =5a(6) =5a(7) =9a(8) =17a(9) =69a(10) =103a(11) =261a(12) =509a(13) =2919a(14) =6029a(15) =27429a(16) =73047a(17) =523687a(18) =1587321a(19) =10285447a(20) =37481773a(21) =334798483a(22) =1395159927a(23) =13476048417a(24) =66683704581a(25) =829426776361

External references