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Triangle read by rows: numbers of isomers of unbranched a-4-catapolyoctagons.
0

%I #3 Mar 30 2012 16:50:29

%S 1,1,1,1,1,1,3,4,4,1,9,16,16,4,1,39,85,84,32,7,1,169,439,465,210,57,7,

%T 1,819,2358,2714,1495,469,86,10,1,3969,12502,15732,10014,3750,834,124,

%U 10,1,19719,66471,90934,65746,28604,7864,1410,166,13,1

%N Triangle read by rows: numbers of isomers of unbranched a-4-catapolyoctagons.

%D J. Brunvoll, S. J. Cyvin and B. N. Cyvin, Isomer enumeration of polygonal systems..., J. Molec. Struct. (Theochem), 364 (1996), 1-13.

%e Triangle begins:

%e 1

%e 1 1

%e 1 1 1

%e 3 4 4 1

%e 9 16 16 4 1

%e 39 85 84 32 7 1

%e 169 439 465 210 57 7 1

%Y Columns give A121101, A121145, A121146.

%K nonn,tabl

%O 0,7

%A _N. J. A. Sloane_, Aug 18 2006