A121942 - OEIS

%I #4 Mar 27 2019 12:05:00

%S 1,5,22,161,1406,14241,164461,2115335,29903139,460066726,7644586673,

%T 136336779596,2596190669230,52552267768902,1126421027176730

%N Number of digraphs of hydrogen bonded water clusters.

%D T. Miyake and M. Aida, "Enumeration of topology-distinct structures of hydrogen bonded water clusters", Chem. Phys. Lett., vol. 363 (2002) pp. 106-110. See Table 1 column 3 on page 109.

%H B. Brinkmann, <a href="https://doi.org/10.1007/s10910-008-9496-y">Generating water clusters and other directed graphs</a>, J. Math. Chem. 46 (4) (2009) 1112-1121, Table 1.

%e If n=5 then the number of digraphs of hydrogen bonded water clusters is 161.

%K nonn

%O 2,2

%A _Parthasarathy Nambi_, Sep 03 2006

%E More terms copied from Brinkmann's table. - _R. J. Mathar_, Mar 27 2019