A007128 - OEIS

%I M1884 #13 Jul 08 2025 17:00:28

%S 1,2,8,50,872,55056,14330784,14168055824,51063045165248,

%T 667216816957658368,31770676467810344050944,

%U 5550693121829253260986015232,3581419675678994222257101230830592,8583524017313906693161883558288460677120

%N Number of unlabeled strength 3 Eulerian graphs with n nodes.

%D R. W. Robinson, personal communication.

%D R. W. Robinson, Numerical implementation of graph counting algorithms, AGRC Grant, Math. Dept., Univ. Newcastle, Australia, 1979.

%D N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

%H R. W. Robinson, <a href="/A007128/b007128.txt">Table of n, a(n) for n = 1..22</a>

%K nonn

%O 1,2

%A _N. J. A. Sloane_