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

A000628

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

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =3a(6) =5a(7) =11a(8) =24a(9) =55a(10) =136a(11) =345a(12) =900a(13) =2412a(14) =6563a(15) =18127a(16) =50699a(17) =143255a(18) =408429a(19) =1173770a(20) =3396844a(21) =9892302a(22) =28972080a(23) =85289390a(24) =252260276a(25) =749329719a(26) =2234695030a(27) =6688893605a(28) =20089296554a(29) =60526543480

External references