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A109572 E.g.f.: x/[1-tan(x)]. 1
0, 1, 2, 6, 32, 200, 1536, 13664, 139264, 1595520, 20316160, 284534272, 4347396096, 71958415360, 1282685272064, 24497477345280, 499058556796928, 10802158189445120, 247567232110952448, 5989035387568652288 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

"Bernoulli numbers" for x/[1-tan(x)].

LINKS

Table of n, a(n) for n=0..19.

FORMULA

a(n) ~ n! * 2^(2*n-1)/Pi^n. - Vaclav Kotesovec, Jun 26 2013

MAPLE

G:=x/(1-tan(x)): Gser:=series(G, x=0, 25): 0, seq(n!*coeff(Gser, x^n), n=1..22);

MATHEMATICA

g[x_] = x/(-1 + Tan[x]) h[x_, n_] = Dt[g[x], {x, n}] a[x_] = Table[ -h[x, n], {n, 0, 50}]; b = a[0]

CROSSREFS

Cf. A057711.

Sequence in context: A271958 A055596 A318976 * A011820 A206300 A224884

Adjacent sequences:  A109569 A109570 A109571 * A109573 A109574 A109575

KEYWORD

nonn

AUTHOR

Roger L. Bagula, Jun 27 2005

STATUS

approved

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Last modified June 25 03:09 EDT 2021. Contains 345449 sequences. (Running on oeis4.)