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1, 2, 6, 20, 98, 502, 2126, 8382, 39624, 203562, 922944, 3886840, 18431462, 93930404, 435553556, 1893481706, 9028569112, 45794495192, 214665970468, 950426429104, 4550599324520, 23012148707800, 108579819367298, 486522336711212, 2336288831626038, 11788749319436714
(list;
graph;
refs;
listen;
history;
text;
internal format)
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