Number of partitions of n if there are two kinds of 1's and two kinds of 2's.
1, 2, 5, 9, 17, 28, 47, 73, 114, 170, 253, 365, 525, 738, 1033, 1422, 1948, 2634, 3545
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Fri Oct 29 05:35:16 CEST 2010 [seqfan] Implementing first 500 sequences in Java