login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A277500 E.g.f.: -LambertW(-tan(x)). 3
0, 1, 2, 11, 80, 821, 10608, 167215, 3105024, 66433129, 1609025024, 43521156755, 1300287942656, 42528924900125, 1511407185512448, 57992816331075511, 2389444376908726272, 105219795048784564945, 4931495123285481881600, 245105773365008603770907 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Robert Israel, Table of n, a(n) for n = 0..384

FORMULA

a(n) ~ sqrt(1+exp(-2)) * arctan(exp(-1))^(1/2-n) * exp(1/2-n) * n^(n-1).

MAPLE

S:= series(-LambertW(-tan(x)), x, 31):

seq(coeff(S, x, n)*n!, n=0..30); # Robert Israel, Mar 09 2017

MATHEMATICA

CoefficientList[Series[-LambertW[-Tan[x]], {x, 0, 20}], x] * Range[0, 20]!

PROG

(PARI) x='x+O('x^50); concat([0], Vec(serlaplace(-lambertw(-tan(x))))) \\ G. C. Greubel, Nov 07 2017

CROSSREFS

Cf. A277479, A277467, A277498, A277501.

Sequence in context: A118969 A181068 A056846 * A197718 A215654 A209094

Adjacent sequences:  A277497 A277498 A277499 * A277501 A277502 A277503

KEYWORD

nonn

AUTHOR

Vaclav Kotesovec, Oct 18 2016

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified June 17 19:10 EDT 2019. Contains 324198 sequences. (Running on oeis4.)