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A105479
a(n) = C(n,2)*Bell(n-2) (cf.
A000217
,
A000110
).
+0
7
0, 0, 1, 3, 12, 50, 225, 1092, 5684, 31572, 186300, 1163085, 7654350, 52928460, 383437327, 2902665885, 22907918640, 188082362120, 1603461748491, 14169892736484, 129594593170210, 1224875863061970, 11948280552370932
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Maintained by
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Last modified November 27 14:50 EST 2009. Contains 167570 sequences.
AT&T Labs Research
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