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 A004957 #22 Feb 22 2023 05:36:01 %S A004957 0,3,6,8,11,14,16,19,21,24,27,29,32,35,37,40,42,45,48,50,53,55,58,61, %T A004957 63,66,69,71,74,76,79,82,84,87,90,92,95,97,100,103,105,108,110,113, %U A004957 116,118,121,124,126,129,131,134 %N A004957 a(n) = ceiling(n*phi^2), where phi is the golden ratio, A001622. %H A004957 Reinhard Zumkeller, <a href="/A004957/b004957.txt">Table of n, a(n) for n = 0..10000</a> %F A004957 A060142(a(n)) = 4 * A060142(n). - _Reinhard Zumkeller_, Nov 26 2012 %o A004957 (Haskell) %o A004957 import Data.List (findIndices) %o A004957 a004957 n = a004957_list !! n %o A004957 a004957_list = findIndices even a060142_list %o A004957 -- _Reinhard Zumkeller_, Nov 26 2012 %Y A004957 Essentially same as A026352. %Y A004957 Cf. A001622. %K A004957 nonn %O A004957 0,2 %A A004957 _N. J. A. Sloane_