A156102 2^(n+1)*P_n(1/2) (see A155100).

1, 1, 5, 10, 70, 440, 4280, 44560, 575920, 8224640, 134583680, 2422639360, 48232203520, 1044455459840, 24541639470080, 620471213148160, 16815502865029120, 485975291876311040, 14924807659888148480, 485281269068774440960, 16656262639515411742720, 601766641496428795658240

Offset

-1,3

Links

Table of n, a(n) for n=-1..20.

Crossrefs

Sequence in context: A174937 A180851 A056316 * A120834 A089745 A356820

Adjacent sequences: A156099 A156100 A156101 * A156103 A156104 A156105

Keyword

nonn

Author

N. J. A. Sloane, Nov 05 2009

Status

approved