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A256157 Number of 2-polymatroids on n unlabeled points. 3
1, 3, 10, 40, 228, 2380, 94495, 320863387 (list; graph; refs; listen; history; text; internal format)
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

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Last modified October 1 10:53 EDT 2022. Contains 357147 sequences. (Running on oeis4.)