3rd power of rooted tree enumerator; number of linear forests of 3 rooted trees.
1, 3, 9, 25, 69, 186, 503, 1353, 3651, 9865, 26748, 72729, 198447, 543159, 1491402
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Fri Oct 29 05:35:16 CEST 2010 [seqfan] Implementing first 500 sequences in Java