%I A003584
%S A003584 1,2,9,52,336,2304,16368,118976,878592,6562816,49447424,375072768,
%T A003584 2860343296,21909012480,168425533440,1298753372160,10041201131520,
%U A003584 77809145610240,604138825973760,4698956908462080,36604934482821120
%N A003584 Unicursal (i.e. possessing an Eulerian path) planar rooted maps with 
               n edges.
%C A003584 Unicursal (in a broad sense) means that no more than two vertices are 
               of odd valency (that is maps possessing an Eulerian path or cycle).
%D A003584 V. A. Liskovets and T. R. S. Walsh, Enumeration of Eulerian and unicursal 
               planar maps, Discr. Math., 282 (2004), 209-221.
%Y A003584 Cf. A000257, A005470.
%Y A003584 a(n)=A000257(n) + A069720(n)
%Y A003584 Sequence in context: A026945 A009310 A091319 this_sequence A069271 A006152 
               A143508
%Y A003584 Adjacent sequences: A003581 A003582 A003583 this_sequence A003585 A003586 
               A003587
%K A003584 nonn,nice
%O A003584 0,2
%A A003584 Valery A. Liskovets (liskov(AT)im.bas-net.by)
%E A003584 More terms from Valery A. Liskovets (liskov(AT)im.bas-net.by), Apr 07 
               2002