A325741 First term of n-th difference sequence of (floor(Pi*k/2)), k >= 0.

1, 1, -2, 4, -8, 16, -32, 64, -127, 246, -456, 792, -1254, 1716, -1716, 1, 6418, -24156, 67080, -162924, 364608, -767976, 1535953, -2922702, 5273624, -8934120, 13904190, -18874260, 18874260, 1, -71705866, 272491892, -763189064, 1865459352, -4190875872

Offset: 1

Author

Clark Kimberling, May 23 2019

Keywords

• easy
• sign

Links

• Clark Kimberling, Table of n, a(n) for n = 1..200

Crossrefs

Cf. A019669, A325664.

Programs

Mathematica

Table[First[Differences[Table[Floor[(Pi/2)*n], {n, 0, 50}], n]], {n, 1, 50}]