Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only either as two by three or three by two blocks.
A146159
Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only either as two by three or three by two blocks.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =7a(5) =15a(6) =60a(7) =184a(8) =747a(9) =3499a(10) =25726a(11) =170389a(12) =1816278a(13) =17509129a(14) =246038108a(15) =3281197739a(16) =66149680918
External references
- oeis: A146159