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A325840 First term of n-th difference sequence of (round(k*sqrt(2))), k >= 0. 1
1, 1, -2, 4, -8, 15, -25, 35, -35, 0, 126, -462, 1253, -2989, 6615, -13867, 27734, -52921, 95863, -163115, 255493, -352716, 379050, -134596, -828875, 3407821, -9217717, 20837509, -41675018, 74480265, -116145145, 143502875, -78990635, -286097760, 1453179125 (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[Round[Sqrt[2]*n], {n, 0, 50}], n]], {n, 1, 50}]

CROSSREFS

Cf. A325664.

Sequence in context: A305992 A082562 A159243 * A262146 A089140 A204555

Adjacent sequences:  A325834 A325835 A325836 * A325841 A325842 A325843

KEYWORD

easy,sign

AUTHOR

Clark Kimberling, Jun 09 2019

STATUS

approved

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Last modified August 19 20:20 EDT 2019. Contains 326133 sequences. (Running on oeis4.)