Number of unrooted steric quartic trees with n (unlabeled) nodes and possessing a centroid; number of n carbon alkanes C(n)H(2n +2) with a centroid when stereoisomers are regarded as different.
A086194
Number of unrooted steric quartic trees with n (unlabeled) nodes and possessing a centroid; number of n carbon alkanes C(n)H(2n +2) with a centroid when stereoisomers are regarded as different.
Terms
- a(0) =1a(1) =0a(2) =1a(3) =1a(4) =3a(5) =2a(6) =11a(7) =9a(8) =55a(9) =70a(10) =345a(11) =494a(12) =2412a(13) =3788a(14) =18127a(15) =30799a(16) =143255a(17) =256353a(18) =1173770a(19) =2190163a(20) =9892302a(21) =19130814a(22) =85289390a(23) =169923748a(24) =749329719a(25) =1531701274a(26) =6688893605a(27) =13984116304a(28) =60526543480a(29) =129073842978
External references
- oeis: A086194