A156073 P_n(2) (see A155100).

1, 2, 5, 20, 130, 1120, 12080, 156320, 2360080, 40721920, 790465280, 17048837120, 404482209280, 10468697374720, 293526944276480, 8863147657809920, 286741939970836480, 9895168120066539520, 362814031120908615680, 14085379571459949854720, 577210378447729271111680

Offset

-1,2

Links

Table of n, a(n) for n=-1..19.

Mathematica

nn = 19; Table[n!, {n, 0, nn}] CoefficientList[Series[1 - Log[Cos[x] - 2*Sin[x]], {x, 0, nn}], x] (* Arkadiusz Wesolowski, Aug 17 2012 *)

Crossrefs

Sequence in context: A012519 A076795 A130293 * A006366 A012317 A297630

Adjacent sequences: A156070 A156071 A156072 * A156074 A156075 A156076

Keyword

nonn

Author

N. J. A. Sloane, Nov 05 2009

Status

approved