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 A168038 #12 Jun 20 2024 11:08:05 %S A168038 0,1,4,4,9,9,9,16,16,16,16,25,25,25,25,25,36,36,36,36,36,36,49,49,49, %T A168038 49,49,49,49,64,64,64,64,64,64,64,64,81,81,81,81,81,81,81,81,81,100, %U A168038 100,100,100,100,100,100,100,100,100,121,121,121,121,121,121,121,121,121 %N A168038 Squares closest to 2*n. %H A168038 Vincenzo Librandi, <a href="/A168038/b168038.txt">Table of n, a(n) for n = 0..1000</a> %F A168038 a(n) = A002024(n)^2. - _Chai Wah Wu_, Jun 19 2024 %t A168038 Round[Sqrt[2*Range[0,120]]]^2 %o A168038 (Python) %o A168038 from math import isqrt %o A168038 def A168038(n): return (isqrt(n<<3)+1>>1)**2 # _Chai Wah Wu_, Jun 19 2024 %Y A168038 Cf. A002024, A093995. %Y A168038 Essentially partial sums of A198954. %K A168038 nonn %O A168038 0,3 %A A168038 _Zak Seidov_, Nov 17 2009