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A143523
a(n) = n-fold Dumont operator of x evaluated at x=y=1, z=3.
+0
2
1, 3, 10, 42, 248, 1992, 19600, 222288, 2851712, 41075328, 658359040, 11621260032, 223832419328, 4669549335552, 104894256056320, 2524539033397248, 64811332658757632, 1767891945806266368, 51060500413513400320
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Maintained by
N. J. A. Sloane
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njas@research.att.com
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Last modified December 9 14:43 EST 2009. Contains 170430 sequences.
AT&T Labs Research
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