%I #6 Feb 27 2015 22:28:09
%S 1,1,1,1,3,1,1,6,9,1,1,10,40,27,1,1,15,125,272,81,1,1,21,315,1625,
%T 1856,243,1
%N Triangle read by rows, giving Kekulé numbers for certain benzenoids (see the Cyvin-Gutman book for details).
%D S. J. Cyvin and I. Gutman, Kekulé structures in benzenoid hydrocarbons, Lecture Notes in Chemistry, No. 46, Springer, New York, 1988 (see p. 210).
%e Triangle begins:
%e 1
%e 1 1
%e 1 3 1
%e 1 6 9 1
%e 1 10 40 27 1
%e 1 15 125 272 81 1
%e 1 21 315 1625 1856 243 1
%Y Diagonals give A000244, A123357, A123358.
%K nonn,tabl,more
%O 0,5
%A _N. J. A. Sloane_, Oct 14 2006