Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only either as two by three or three by two blocks.
A146158
Number of n X n binary arrays symmetric under 90 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) =1a(5) =3a(6) =8a(7) =14a(8) =23a(9) =49a(10) =124a(11) =341a(12) =1108a(13) =3645a(14) =13272a(15) =50449a(16) =210792a(17) =970179a(18) =4987095a(19) =27600222a(20) =171681370a(21) =1133281367a(22) =8288847384a(23) =64922838278a(24) =565664086802
External references
- oeis: A146158