Number of distinct degree sequences among all connected graphs with n nodes.

A007721

Number of distinct degree sequences among all connected graphs with n nodes.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =6a(4) =19a(5) =68a(6) =236a(7) =863a(8) =3137a(9) =11636a(10) =43306a(11) =162728a(12) =614142a(13) =2330454a(14) =8875656a(15) =33924699a(16) =130038017a(17) =499753560a(18) =1924912505a(19) =7429159770a(20) =28723877046a(21) =111236422377a(22) =431403469046

External references