This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A330344 #6 Dec 12 2019 09:33:31
%S A330344 0,1,2,4,13,50,367
%N A330344 Number of unlabeled graphs with n vertices whose covered portion has exactly two automorphisms.
%F A330344 Partial sums of A330346.
%e A330344 Non-isomorphic representatives of the a(2) = 1 through a(5) = 13 graphs:
%e A330344 {12} {12} {12} {12}
%e A330344 {12,13} {12,13} {12,13}
%e A330344 {12,13,24} {12,13,24}
%e A330344 {12,13,14,23} {12,13,14,23}
%e A330344 {12,13,14,25}
%e A330344 {12,13,24,35}
%e A330344 {12,13,14,23,25}
%e A330344 {12,13,14,23,45}
%e A330344 {12,13,15,24,34}
%e A330344 {12,13,14,15,23,24}
%e A330344 {12,13,14,23,24,35}
%e A330344 {12,13,14,23,25,45}
%e A330344 {12,13,14,15,23,24,35}
%Y A330344 The labeled version is A330345.
%Y A330344 The covering case is A330346 (not A241454).
%Y A330344 Unlabeled graphs are A000088.
%Y A330344 Unlabeled graphs with exactly one automorphism are A003400.
%Y A330344 Unlabeled connected graphs with exactly one automorphism are A124059.
%Y A330344 Graphs with exactly two automorphisms are A330297 (labeled covering), A330344 (unlabeled), A330345 (labeled), and A330346 (unlabeled covering).
%Y A330344 Cf. A000612, A004111, A055621, A241454, A283877, A330098, A330227, A330230, A330231, A330233, A330294, A330295.
%K A330344 nonn,more
%O A330344 1,3
%A A330344 _Gus Wiseman_, Dec 12 2019