Number of achiral color patterns (set partitions) in a row or cycle of length n with 4 or fewer colors (subsets).
A305750
Number of achiral color patterns (set partitions) in a row or cycle of length n with 4 or fewer colors (subsets).
Terms
- a(0) =1a(1) =1a(2) =2a(3) =3a(4) =7a(5) =11a(6) =27a(7) =43a(8) =107a(9) =171a(10) =427a(11) =683a(12) =1707a(13) =2731a(14) =6827a(15) =10923a(16) =27307a(17) =43691a(18) =109227a(19) =174763a(20) =436907a(21) =699051a(22) =1747627a(23) =2796203a(24) =6990507a(25) =11184811a(26) =27962027a(27) =44739243a(28) =111848107a(29) =178956971
External references
- oeis: A305750