|
%I #18 Dec 02 2017 21:53:12
%S 1,3,918,6669,33665,131616,425866,1192178,2977857
%N Number of bilaterally asymmetric 8-hoops with n symbols and no a-rooted trees.
%C It appears that table 2 of the Williamson article contains typographical errors and the sequence was intended to read as in A210699.
%H Williamson, S. G. <a href="http://dx.doi.org/10.1016/0012-365X(72)90043-X">The combinatorial analysis of patterns and the principle of inclusion-exclusion</a>. Discrete Math. 1 (1972), no. 4, 357--388. MR0299493 (45 #8541)
%Y Cf. A210766, A060560, A295925.
%K nonn
%O 2,2
%A _N. J. A. Sloane_, Mar 25 2012
|
