A325743 First term of n-th difference sequence of (floor(Pi*k/4)), k >= 0.

0, 1, -1, 1, -2, 6, -16, 36, -71, 126, -201, 276, -276, 0, 1014, -3744, 10179, -24309, 54126, -115614, 240444, -490104, 980209, -1918752, 3658449, -6750224, 11950524, -20058300, 31303782, -43733304, 49586229, -28048799, -67798986, 331797126, -932095976

Offset: 1

Author

Clark Kimberling, Jun 06 2019

Keywords

• easy
• sign

Links

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

Crossrefs

Cf. A003881, A325664.

Programs

Mathematica

Table[First[Differences[Table[Floor[(Pi/4)*n], {n, 0, 50}], n]], {n, 1, 50}]