OFFSET
1,4
COMMENTS
Number of labeled squarefree graphs on n nodes with A006855(n) edges. - Max Alekseyev, Jan 29 2022
LINKS
Max Alekseyev, Table of n, a(n) for n = 1..37
PROG
(Sage) a191966 = lambda n: sum( factorial(n) // g.automorphism_group(return_group=False, order=True) for g in graphs.nauty_geng(options=f'-c -f {n} {oeis(6855)(n)}:0') ) # Max Alekseyev, Jan 29 2022
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin and N. J. A. Sloane, Jun 18 2011
EXTENSIONS
a(11)-a(21) from Max Alekseyev, Jan 29 2022
Corrected and extended to a(37) by Max Alekseyev, Mar 12 2023
STATUS
approved