A156108 P_{2n+1}(sqrt(2)) (see A155100).

1, 3, 42, 2208, 244752, 46518528, 13507994112, 5562729781248, 3083754373711872, 2214222213310906368, 1999032386887572652032, 2216366828444296453029888, 2960497368303914832695918592, 4689088728161336381621359607808, 8689565950333823666093720497815552, 18626301728606130165475133482365616128

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