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Triangle giving number of unbranched catapolytetragons, read by rows.
2

%I #5 Mar 30 2012 16:47:49

%S 1,1,1,1,1,1,1,3,3,2,1,3,9,7,4,1,5,16,29,23,10,1,5,27,62,99,69,25,1,7,

%T 39,132,275,351,229,70,1,7,55,221,643,1121,1249,731,196,1,9,72,367,

%U 1278,2997,4584,4437,2385,574,1,9,93,540,2322,6678,13458,18012,15597,7657,1681

%N Triangle giving number of unbranched catapolytetragons, read by rows.

%D S. J. Cyvin et al., Unbranched catacondensed polygonal systems containing hexagons and tetragons, Croatica Chem. Acta, 69 (1996), 757-774.

%e 1; 1,1; 1,1,1; 1,3,3,2; 1,3,9,7,4; ...

%Y Last diagonal is A001998.

%Y LCM's of all cycles: A060113.

%K nonn,easy,tabl

%O 0,8

%A _N. J. A. Sloane_, May 03 2000