Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 00100-11111-00100 pattern in any orientation.

A147005

Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 00100-11111-00100 pattern in any orientation.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =3a(5) =1a(6) =5a(7) =1a(8) =8a(9) =1a(10) =60a(11) =7a(12) =328a(13) =21a(14) =2111a(15) =77a(16) =21687a(17) =479a(18) =274683a(19) =3600a(20) =4419391

External references