A138347 Number of squarefree bipartite graphs on n vertices.

1, 2, 3, 6, 10, 21, 39, 86, 182, 440, 1074, 2941, 8424, 26720, 90883, 340253, 1384567, 6186907, 30219769, 161763233, 946742190, 6054606722, 42229136988, 320741332093, 2648348712904

Offset

1,2

Links

Table of n, a(n) for n=1..25.

CombOS - Combinatorial Object Server, Generate graphs

B. D. McKay, Isomorph-free exhaustive generation, J Algorithms, 26 (1998) 306-324.

Crossrefs

Cf. A006786, A300749.

Sequence in context: A063687 A359019 A002988 * A211180 A265582 A242563

Adjacent sequences: A138344 A138345 A138346 * A138348 A138349 A138350

Keyword

nonn

Author

Vladeta Jovovic, May 18 2008

Extensions

More terms from Brendan McKay, Feb 04 2013

One more term from Brendan McKay, Mar 11 2018

Status

approved