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A000304
a(n) = a(n-1) a(n-2).
+0
3
2, 3, 6, 18, 108, 1944, 209952, 408146688, 85691213438976, 34974584955819144511488, 2997014624388697307377363936018956288
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Maintained by
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Last modified December 21 10:15 EST 2009. Contains 171081 sequences.
AT&T Labs Research
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