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1, 4, 14, 50, 180, 651, 2387, 8833, 32981, 123991, 468476, 1778564, 6779824, 25939287, 99558312, 383146247, 1478074248, 5714228324, 22133961135, 85885304838, 333778557727, 1299016042584, 5062113733182, 19749838547551, 77137907898735, 301582958980900
(list;
graph;
refs;
listen;
history;
text;
internal format)
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