A241576 - OEIS

%I #7 Dec 17 2019 19:20:31

%S 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,

%T 702,994,1406,1987,2812,3975,5622,7951,11244,15902,22488,31804,44976,

%U 63607,89954,127213,179908,254427,359814,508855,719628,1017709

%N Third differences of A001521.

%t Differences[NestList[Floor[Sqrt[2#(#+1)]]&,1,50],3] (* _Harvey P. Dale_, Dec 17 2019 *)

%Y Cf. A001521, A017911, A190660.

%K nonn

%O 1,8

%A _N. J. A. Sloane_, Apr 27 2014