Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 110-111-011 pattern in any orientation.
A146255
Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 110-111-011 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =1a(4) =5a(5) =9a(6) =27a(7) =79a(8) =359a(9) =979a(10) =7545a(11) =28031a(12) =289781a(13) =1662565a(14) =22704081a(15) =184816617a(16) =3459666973a(17) =37715425193
External references
- oeis: A146255