0,1

Table of n, a(n) for n=0..4.

For n=0, the two sets are the empty set and a set containing a single isolated vertex. - Sean A. Irvine, Nov 22 2019

Sequence in context: A006989 A236399 A132529 * A140984 A057996 A009090

Adjacent sequences: A027678 A027679 A027680 * A027682 A027683 A027684

nonn,hard,more

R. H. Hardin

a(0) corrected by Sean A. Irvine, Nov 22 2019

approved