Number of distinct (unordered) pairs of partitions of a 9-element set that have Rand distance n.

Terms

a(0) =31572a(1) =141624a(2) =452508a(3) =1341648a(4) =3266172a(5) =7234374a(6) =12259368a(7) =18992502a(8) =23324140a(9) =28129626a(10) =26605908a(11) =26190612a(12) =21568932a(13) =17119818a(14) =13040280a(15) =8948079a(16) =6244308a(17) =3679032a(18) =2431044a(19) =1250109a(20) =640908a(21) =315828a(22) =197568a(23) =57288a(24) =46116a(25) =30366a(26) =25732a(27) =7695a(28) =4104a(29) =2226