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Triangle read by rows, giving Kekulé numbers for certain benzenoids (see the Cyvin-Gutman book for details).
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%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