A256157 Number of 2-polymatroids on n unlabeled points.

1, 3, 10, 40, 228, 2380, 94495, 320863387

Offset

0,2

Links

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

Jayant Apte, JM Walsh, Constrained Linear Representability of Polymatroids and Algorithms for Computing Achievability Proofs in Network Coding, arXiv preprint arXiv:1605.04598, 2016

Thomas J. Savitsky, Enumeration of 2-polymatroids on up to seven elements. SIAM J. Discrete Math., 28(4):1641-1650, 2014. arXiv:1401.8006

Crossrefs

Row sums of A256156.

Cf. A256158, A256159, A055545

Sequence in context: A009374 A297213 A216386 * A137781 A208125 A213108

Adjacent sequences: A256154 A256155 A256156 * A256158 A256159 A256160

Keyword

nonn,more

Author

Max Alekseyev, Mar 16 2015

Status

approved