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!)
A156108 P_{2n+1}(sqrt(2)) (see A155100). 2
1, 3, 42, 2208, 244752, 46518528, 13507994112, 5562729781248, 3083754373711872, 2214222213310906368, 1999032386887572652032, 2216366828444296453029888, 2960497368303914832695918592, 4689088728161336381621359607808, 8689565950333823666093720497815552, 18626301728606130165475133482365616128 (list; graph; refs; listen; history; text; internal format)
OFFSET

-1,2

LINKS

G. C. Greubel, Table of n, a(n) for n = -1..207

MATHEMATICA

p[n_, u_]:= D[Tan[x], {x, n}] /. Tan[x] -> u /. Sec[x] -> Sqrt[1 + u^2] // Expand; p[-1, u_] = 1; Table[p[n, Sqrt[2]], {n, -1, 50}][[1 ;; ;; 2]] (* G. C. Greubel, Sep 28 2018 *)

CROSSREFS

Sequence in context: A195010 A333323 A331705 * A210929 A083402 A145984

Adjacent sequences:  A156105 A156106 A156107 * A156109 A156110 A156111

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Nov 05 2009

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 September 23 20:42 EDT 2021. Contains 347617 sequences. (Running on oeis4.)