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EXAMPLE
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In the following examples elements in series are juxtaposed and elements in parallel are separated by '|'.
a(2) = 3: (12), (21), (22), (1|2).
a(3) = 22: (112), (121), (122), (211), (212), (221), (1(1|2)), (1(2|2)), (2(1|1)), (2(1|2)), ((1|1)2), ((1|2)1), ((1|2)2), ((2|2)1), (1|12), (1|21), (1|22), (2|21), (11|2), (12|2), (1|1|2), (1|2|2).
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