Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1110-0100-0111 pattern in any orientation.
A146877
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1110-0100-0111 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =13a(8) =37a(9) =65a(10) =121a(11) =421a(12) =1309a(13) =3649a(14) =15177a(15) =81237a(16) =474405a(17) =2569641a(18) =13240801a(19) =84039101a(20) =586237485
External references
- oeis: A146877