A320489 - OEIS

%I #10 Jan 26 2020 16:28:21

%S 1,2,6,40,581,17954,1376484,275524246,147627941386,213261119287108,

%T 836129127802137203,8961301472286672235092,

%U 264386586050074867407985650,21609889100291959988235675761782,4921292113269596022145447106163528469,3138303995382684496665239674427115214538716

%N Number of connected nets on n unlabeled nodes.

%H Andrew Howroyd, <a href="/A320489/b320489.txt">Table of n, a(n) for n = 0..50</a>

%H Edward A. Bender and E. Rodney Canfield, <a href="https://doi.org/10.1016/0095-8956(83)90040-0">Enumeration of connected invariant graphs</a>, Journal of Combinatorial Theory, Series B 34.3 (1983): 268-278. See p. 274.

%H N. J. A. Sloane, <a href="/transforms.txt">Transforms</a>

%F EULERi transform of A004103.

%Y Cf. A004103.

%K nonn

%O 0,2

%A _N. J. A. Sloane_, Oct 25 2018

%E a(0)=1 prepended by _Andrew Howroyd_, Jan 26 2020