Number of distinct characteristic polynomials of trees with n nodes.

A226594

Number of distinct characteristic polynomials of trees with n nodes.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =3a(6) =6a(7) =11a(8) =22a(9) =42a(10) =102a(11) =204a(12) =488a(13) =1078a(14) =2723a(15) =6403a(16) =16479a(17) =40313a(18) =106135a(19) =271295a(20) =724455

External references