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 A018064 #21 Jun 03 2025 16:02:03 %S A018064 1,2,3,4,7,11,19,30,49,80,130,211,343,558,907,1476,2401,3905,6352, %T A018064 10333,16807,27338,44467,72329,117649,191365,311270,506304,823543, %U A018064 1339556,2178890,3544131,5764801,9376890,15252230,24808920,40353607,65638231 %N A018064 Powers of fourth root of 7 rounded to nearest integer. %H A018064 Vincenzo Librandi, <a href="/A018064/b018064.txt">Table of n, a(n) for n = 0..2000</a> %t A018064 Round[(Power[7, (4)^-1])^Range[0,40]] (* _Harvey P. Dale_, Jan 16 2011 *) %o A018064 (Python) %o A018064 from sympy import integer_nthroot %o A018064 def A018064(n): return -integer_nthroot(m:=7**n, 4)[0]+integer_nthroot(m<<4, 4)[0] # _Chai Wah Wu_, Jun 20 2024 %o A018064 (Magma) R := RealField(20); r := R!7^(1/4); vals := [Round(r^i) : i in [0..40]]; print vals; // _Vincenzo Librandi_, May 31 2025 %Y A018064 Cf. A011005. %K A018064 nonn %O A018064 0,2 %A A018064 _N. J. A. Sloane_