This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A241576 #7 Dec 17 2019 19:20:31 %S A241576 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 A241576 702,994,1406,1987,2812,3975,5622,7951,11244,15902,22488,31804,44976, %U A241576 63607,89954,127213,179908,254427,359814,508855,719628,1017709 %N A241576 Third differences of A001521. %t A241576 Differences[NestList[Floor[Sqrt[2#(#+1)]]&,1,50],3] (* _Harvey P. Dale_, Dec 17 2019 *) %Y A241576 Cf. A001521, A017911, A190660. %K A241576 nonn %O A241576 1,8 %A A241576 _N. J. A. Sloane_, Apr 27 2014