%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