Number of spiro bicyclic skeletons with n carbon atoms (see Parks et al. for precise definition).
A121159
Number of spiro bicyclic skeletons with n carbon atoms (see Parks et al. for precise definition).
Terms
- a(0) =1a(1) =4a(2) =16a(3) =53a(4) =175a(5) =547a(6) =1692a(7) =5127a(8) =15408a(9) =45831a(10) =135500a(11) =398186a(12) =1165005a(13) =3394880a(14) =9861048a(15) =28561403a(16) =82525483a(17) =237941827a(18) =684778523a(19) =1967510639
External references
- oeis: A121159