Number of spiro bicyclic skeletons with n carbon atoms (see Parks et al. for precise definition).

A121160

Number of spiro bicyclic skeletons with n carbon atoms (see Parks et al. for precise definition).

Terms

    a(0) =1a(1) =1a(2) =6a(3) =12a(4) =43a(5) =106a(6) =322a(7) =864a(8) =2483a(9) =6829a(10) =19226a(11) =53293a(12) =148866a(13) =413501a(14) =1151506a(15) =3200184a(16) =8901478a(17) =24742852a(18) =68800520a(19) =191275736a(20) =531888416

External references