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A241576
Third differences of A001521.
1
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
MATHEMATICA
Differences[NestList[Floor[Sqrt[2#(#+1)]]&, 1, 50], 3] (* Harvey P. Dale, Dec 17 2019 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Apr 27 2014
STATUS
approved