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A002302 Generalized tangent numbers.
(Formerly M2093 N0828)
1
2, 16, 136, 1232, 12096, 129024, 1491840, 18627840, 250145280, 3597834240, 55212917760, 900842342400, 15575854694400, 284549942476800, 5477586392678400, 110832202594713600, 2351805274570752000 (list; graph; refs; listen; history; text; internal format)
OFFSET
3,1
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.
LINKS
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
CROSSREFS
Sequence in context: A264333 A001252 A067058 * A348803 A369580 A056662
KEYWORD
nonn
AUTHOR
EXTENSIONS
More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Nov 20 2006
STATUS
approved

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Last modified March 28 17:42 EDT 2024. Contains 371254 sequences. (Running on oeis4.)