A241576 Third differences of A001521.

0, 1, 0, 0, 1, 0, 1, 2, 2, 2, 4, 6, 8, 10, 16, 22, 31, 44, 62, 88, 124, 176, 248, 352, 497, 702, 994, 1406, 1987, 2812, 3975, 5622, 7951, 11244, 15902, 22488, 31804, 44976, 63607, 89954, 127213, 179908, 254427, 359814, 508855, 719628, 1017709

Offset

1,8

Links

Table of n, a(n) for n=1..47.

Mathematica

Differences[NestList[Floor[Sqrt[2#(#+1)]]&, 1, 50], 3] (* Harvey P. Dale, Dec 17 2019 *)

Crossrefs

Cf. A001521, A017911, A190660.

Sequence in context: A262669 A345256 A291299 * A306749 A338286 A272371

Adjacent sequences: A241573 A241574 A241575 * A241577 A241578 A241579

Keyword

nonn

Author

N. J. A. Sloane, Apr 27 2014

Status

approved