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A147719
A141479
(n+1)/3.
+0
1
1, 1, 1, 2, 6, 21, 91, 462, 2646, 16841, 117931, 900922, 7456086, 66453661, 634585771, 6463837382, 69955114326, 801626558481, 9696295037611, 123457062745842, 1650499351041366, 23116291464379301, 338474628835617451
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Maintained by
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Last modified December 13 23:45 EST 2009. Contains 170824 sequences.
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