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 A154281 #12 Jan 03 2024 23:47:00
%S A154281 1,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
%T A154281 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
%U A154281 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
%N A154281 1,0,0,1 followed by 0,0,0...
%C A154281 Dirichlet inverse of this sequence is A154282.
%F A154281 Multiplicative with a(2^2) = 1, a(2^e) = 0 for e<>2, a(p^e) = 0 for odd prime p. - _Andrew Howroyd_, Aug 05 2018
%t A154281 PadRight[{1,0,0,1},120,0] (* _Harvey P. Dale_, Aug 06 2012 *)
%o A154281 (PARI) a(n)={n==1 || n==4} \\ _Andrew Howroyd_, Aug 05 2018
%Y A154281 Cf. A154272, A154271, A154269.
%K A154281 nonn,mult
%O A154281 1,1
%A A154281 _Mats Granvik_, Jan 06 2009