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A002303
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Generalized tangent numbers.
(Formerly M5023 N2166)
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0
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16, 272, 3968, 56320, 814080, 12207360, 191431680, 3149752320, 54428774400, 987559372800, 18797300121600, 374883257548800, 7822865085235200, 170560590520320000, 3879770715684864000, 91945674412720128000
(list; graph; refs; listen; history; internal format)
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OFFSET
| 4,1
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REFERENCES
| N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
Letterio Toscano, Sulla Derivata di Ordinen della Funzione tg(x), Tohoku Math. J., 42 (1936), 144-154.
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PROG
| (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
| Sequence in context: A158574 A000487 A197622 * A158610 A004382 A204955
Adjacent sequences: A002300 A002301 A002302 * A002304 A002305 A002306
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
| More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Nov 20 2006
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