A382157 Number of n-node digraphs without loops, not necessarily connected, which are squares.

1, 1, 3, 9, 46, 473, 13763, 1121383

Offset

0,3

Comments

For the definition of the square of a graph, see A382180.

Links

Table of n, a(n) for n=0..7.

Crossrefs

Cf. A382180. A382158, A382159.

Sequence in context: A190625 A317079 A190627 * A221986 A018445 A129432

Adjacent sequences: A382154 A382155 A382156 * A382158 A382159 A382160

Keyword

nonn,more

Author

N. J. A. Sloane, Mar 24 2025, based on an email from Brendan McKay, Mar 18 2025

Status

approved