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A009244
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Expansion of e.g.f.: exp(tan(x))/cos(x).
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3
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1, 1, 2, 6, 20, 92, 448, 2688, 17296, 127312, 1013600, 8850336, 83547584, 845380928, 9196867072, 105911556096, 1301697829120, 16814357324032, 230093807905280, 3294279618252288, 49636887216382976
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OFFSET
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0,3
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LINKS
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Vaclav Kotesovec, Table of n, a(n) for n = 0..477
P. Barry, Constructing Exponential Riordan Arrays from Their A and Z Sequences, Journal of Integer Sequences, 17 (2014), #14.2.6.
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MATHEMATICA
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With[{nn=30}, CoefficientList[Series[Exp[Tan[x]]/Cos[x], {x, 0, nn}], x] Range[ 0, nn]!] (* Harvey P. Dale, Jun 06 2014 *)
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CROSSREFS
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Sequence in context: A027315 A005965 A000421 * A104985 A210690 A079575
Adjacent sequences: A009241 A009242 A009243 * A009245 A009246 A009247
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KEYWORD
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nonn,easy
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AUTHOR
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R. H. Hardin
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EXTENSIONS
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Extended and signs tested by Olivier Gérard, Mar 15 1997
Prior Mathematica program replaced and definition clarified by Harvey P. Dale, Jun 06 2014
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STATUS
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approved
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