OFFSET
0,5
COMMENTS
Initial terms computed using software at http://users.cecs.anu.edu.au/~bdm/nauty/
Also number of carbon allotropes satisfying the octet rule, excluding stereoisomers. - Natan Arie Consigli, Jun 06 2017
FORMULA
Euler transform of A129417. - Andrew Howroyd, Mar 14 2020
PROG
(nauty/bash) geng -d1 ${n} -q | multig -r4 -u # Natan Arie Consigli, Jun 06 2017
CROSSREFS
KEYWORD
nonn
AUTHOR
Brendan McKay, Apr 15 2007
EXTENSIONS
a(0)-a(1) by Natan Arie Consigli, Jun 06 2017
a(18)-a(25) from Andrew Howroyd, Mar 17 2020
STATUS
approved