Number of nonisomorphic proper colorings of partition star graph using six colors.

Terms

a(0) =6a(1) =30a(2) =90a(3) =150a(4) =210a(5) =750a(6) =750a(7) =420a(8) =2250a(9) =1950a(10) =3750a(11) =3750a(12) =756a(13) =5250a(14) =9750a(15) =11250a(16) =18750a(17) =18750a(18) =18750a(19) =1260a(20) =10500a(21) =29250a(22) =17550a(23) =26250a(24) =93750a(25) =47250a(26) =56250a(27) =93750a(28) =93750a(29) =93750