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A058797
a(-1) = 0, a(0) = 1; thereafter a(n) = n*a(n-1)-a(n-2).
+0
4
0, 1, 1, 1, 2, 7, 33, 191, 1304, 10241, 90865, 898409, 9791634, 116601199, 1506023953, 20967734143, 313009988192, 4987192076929, 84469255319601, 1515459403675889, 28709259414522290, 572669728886769911
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Maintained by
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Last modified December 15 00:47 EST 2009. Contains 170825 sequences.
AT&T Labs Research
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