login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A238261 Decimal expansion of a constant related to A187235. 4
4, 9, 1, 0, 8, 1, 4, 9, 6, 4, 5, 6, 8, 2, 5, 5, 8, 9, 8, 7, 5, 1, 5, 3, 4, 8, 0, 5, 2, 4, 0, 3, 5, 2, 1, 9, 7, 8, 9, 8, 7, 0, 5, 2, 8, 1, 7, 6, 7, 8, 4, 7, 1, 7, 6, 1, 3, 9, 4, 1, 1, 2, 0, 2, 2, 5, 6, 4, 1, 7, 8, 7, 7, 8, 7, 9, 9, 4, 7, 9, 7, 2, 9, 5, 1, 8, 1, 9, 7, 4, 1, 5, 3, 5, 5, 4, 4, 6, 1, 4, 2, 5, 0, 5, 3 (list; constant; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..105.

V. Kotesovec, Non-attacking chess pieces, 6ed, 2013, p.261.

FORMULA

Equals lim n->infinity (A187235(n)/(n-1)!)^(1/n).

Equals -(2*LambertW(-1,-exp(-1/2)/2))^2 / (1 + 2*LambertW(-1,-exp(-1/2)/2)).

EXAMPLE

4.9108149645682558987515348...

MATHEMATICA

RealDigits[N[-(2*LambertW[-1, -1/2/Sqrt[E]])^2/(1+2*LambertW[-1, -1/2/Sqrt[E]]), 105]][[1]]

CROSSREFS

Cf. A187235, A238262, A002465, A129256, A342111.

Sequence in context: A135244 A334657 A011514 * A245238 A011238 A002993

Adjacent sequences:  A238258 A238259 A238260 * A238262 A238263 A238264

KEYWORD

nonn,cons

AUTHOR

Vaclav Kotesovec, Feb 21 2014

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 May 15 23:24 EDT 2021. Contains 343937 sequences. (Running on oeis4.)