Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only either three adjacent vertically or three adjacent horizontally.

A145764

Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only either three adjacent vertically or three adjacent horizontally.

Terms

    a(0) =1a(1) =1a(2) =5a(3) =5a(4) =24a(5) =73a(6) =566a(7) =2483a(8) =32841a(9) =234437a(10) =5307036a(11) =61459976a(12) =2279718182a(13) =44700555075

External references