Number of n-node unrooted quartic trees; number of n-carbon alkanes C(n)H(2n+2) ignoring stereoisomers.

A000602

Number of n-node unrooted quartic trees; number of n-carbon alkanes C(n)H(2n+2) ignoring stereoisomers.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =3a(6) =5a(7) =9a(8) =18a(9) =35a(10) =75a(11) =159a(12) =355a(13) =802a(14) =1858a(15) =4347a(16) =10359a(17) =24894a(18) =60523a(19) =148284a(20) =366319a(21) =910726a(22) =2278658a(23) =5731580a(24) =14490245a(25) =36797588a(26) =93839412a(27) =240215803a(28) =617105614a(29) =1590507121

External references