Number of chiral pairs of color patterns (set partitions) for a row of length n.
A320937
Number of chiral pairs of color patterns (set partitions) for a row of length n.
Terms
- a(0) =0a(1) =0a(2) =1a(3) =4a(4) =20a(5) =86a(6) =409a(7) =1988a(8) =10404a(9) =57488a(10) =338180a(11) =2103378a(12) =13814202a(13) =95423766a(14) =691415451a(15) =5239857008a(16) =41431883216a(17) =341036489096
External references
- oeis: A320937