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A325741 First term of n-th difference sequence of (floor(Pi*k/2)), k >= 0. 2
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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

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

MATHEMATICA

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

CROSSREFS

Cf. A019669, A325664.

Sequence in context: A258585 A235701 A054044 * A008859 A145113 A062257

Adjacent sequences:  A325738 A325739 A325740 * A325742 A325743 A325744

KEYWORD

easy,sign

AUTHOR

Clark Kimberling, May 23 2019

STATUS

approved

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Last modified December 6 14:15 EST 2019. Contains 329806 sequences. (Running on oeis4.)