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Search: id:A006229
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| A006229 |
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Expansion of exp( tan x ).
(Formerly M2822)
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+0
5
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| 1, 1, 1, 3, 9, 37, 177, 959, 6097, 41641, 325249, 2693691, 24807321, 241586893, 2558036145, 28607094455, 342232522657, 4315903789009, 57569080467073, 807258131578995, 11879658510739497, 183184249105857781
(list; graph; listen)
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OFFSET
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0,4
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REFERENCES
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L. Comtet, Advanced Combinatorics, Reidel, 1974, p. 259, Sum_{k} T(n,k).
CRC Standard Mathematical Tables and Formulae, 30th ed. 1996, p. 42.
L. B. W. Jolley, Summation of Series. 2nd ed., Dover, NY, 1961, p. 150.
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LINKS
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T. D. Noe, Table of n, a(n) for n=0..100
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FORMULA
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E.g.f.: exp(tan(x)).
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CROSSREFS
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Cf. A003711, A003717.
Cf. A047691, A047692. Row sums of A059419 and unsigned A111593.
Sequence in context: A002751 A119856 A077365 this_sequence A008986 A105215 A009179
Adjacent sequences: A006226 A006227 A006228 this_sequence A006230 A006231 A006232
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KEYWORD
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nonn,easy,nice
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AUTHOR
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njas, Jeffrey Shallit
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EXTENSIONS
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More terms from Larry Reeves (larryr(AT)acm.org), Feb 08 2001
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