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 A274090 #19 Jun 20 2016 19:36:20 %S A274090 0,1,1,-1,-7,-15,-28,-43,-61,-80,-100,-119,-137,-151,-162,-167,-167, %T A274090 -161,-147,-125,-95,-57,-11,44,107,177,255,339,429,524,623,725,830, %U A274090 935,1040,1143,1244,1342,1434,1520,1599,1669,1730,1780,1819,1845,1858,1857,1841,1810,1763,1700,1621,1525 %N A274090 a(n) = nearest integer to n^2 * cos(sqrt(n)). %H A274090 N. J. A. Sloane and Chai Wah Wu, <a href="/A274090/b274090.txt">Table of n, a(n) for n = 0..10000</a> n = 0..1000 from N. J. A. Sloane. %p A274090 Digits:=50: f:=n->round(evalf(n^2*cos(sqrt(n)))); [seq(f(n),n=0..120)]; %o A274090 (Python) %o A274090 from sympy import cos, sqrt %o A274090 def A274090(n): %o A274090 return int((n**2*cos(sqrt(n))).round()) # _Chai Wah Wu_, Jun 11 2016 %Y A274090 Sequences of the same type: A272695, A274086, A274087, A274088, A274090, A274091, A274092, A274095, A274096, A274097, A274101, A274102. %K A274090 sign %O A274090 0,5 %A A274090 _N. J. A. Sloane_, Jun 10 2016