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A002302
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Generalized tangent numbers.
(Formerly M2093 N0828)
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0
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2, 16, 136, 1232, 12096, 129024, 1491840, 18627840, 250145280, 3597834240, 55212917760, 900842342400, 15575854694400, 284549942476800, 5477586392678400, 110832202594713600, 2351805274570752000
(list; graph; refs; listen; history; internal format)
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OFFSET
| 3,1
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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+4, n)", ")) - Herman Jamke (hermanjamke(AT)fastmail.fm), Nov 20 2006
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CROSSREFS
| Sequence in context: A037622 A001252 A067058 * A056662 A151402 A199565
Adjacent sequences: A002299 A002300 A002301 * A002303 A002304 A002305
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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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