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1, 4, 19, 72, 355, 1347, 6843, 26077, 135752, 519336, 2760110, 10591394, 57299551, 220393887, 1210772453, 4665698732, 25974365600, 100243916036, 564517479641, 2181476412875, 12407767954139, 48002072364351, 275392803316254, 1066512702720864, 6164746100658825, 23896975393255717
(list;
graph;
refs;
listen;
history;
text;
internal format)
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