The number of degree sequences of simple graphs with n vertices with all even degrees.

Terms

a(0) =1a(1) =1a(2) =2a(3) =3a(4) =7a(5) =14a(6) =36a(7) =74a(8) =201a(9) =425a(10) =1178a(11) =2515a(12) =7063a(13) =15209a(14) =43088a(15) =93382a(16) =266236a(17) =579950a(18) =1661548a(19) =3634062a(20) =10451798a(21) =22935259a(22) =66170288a(23) =145601216a(24) =421164456a(25) =928875440a(26) =2692737120a(27) =5950570725a(28) =17282501978a(29) =38257352346