Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 101-111-101 pattern in any orientation.
A146435
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 101-111-101 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =3a(7) =7a(8) =15a(9) =21a(10) =45a(11) =85a(12) =217a(13) =491a(14) =1576a(15) =4887a(16) =18646a(17) =57135a(18) =229742a(19) =795595a(20) =3741694a(21) =15529847a(22) =86241543a(23) =433623155a(24) =2850108871a(25) =16134076143a(26) =119392023601a(27) =762153190955
External references
- oeis: A146435