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Search: id:A002303
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| A002303 |
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Generalized tangent numbers.
(Formerly M5023 N2166)
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+0
1
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| 16, 272, 3968, 56320, 814080, 12207360, 191431680, 3149752320, 54428774400, 987559372800, 18797300121600, 374883257548800, 7822865085235200, 170560590520320000, 3879770715684864000, 91945674412720128000
(list; graph; listen)
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OFFSET
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4,1
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REFERENCES
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N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
Letterio Toscano, Sulla Derivata di Ordinen della Funzione tg(x), Tohoku Math. J., 42 (1936), 144-154.
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PROGRAM
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(PARI) a(n, k)=if(k<0, 0, if(n==1 && k==1, 1, if(k>n, 0, (k-1)*a(n-1, k-1)+(k+1)*a(n-1, k+1)))) for(n=0, 25, print1(a(n+6, n)", ")) - Herman Jamke (hermanjamke(AT)fastmail.fm), Nov 20 2006
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CROSSREFS
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Sequence in context: A144660 A158574 A000487 this_sequence A158610 A004382 A038758
Adjacent sequences: A002300 A002301 A002302 this_sequence A002304 A002305 A002306
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
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More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Nov 20 2006
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