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 A167891 #5 Jan 20 2022 08:32:16
%S A167891 1,4,2,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
%T A167891 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 A167891 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
%N A167891 A000004 preceded by 1, 4, 2.
%C A167891 Inverse binomial transform of A028387.
%F A167891 a(0) = 1, a(1) = 4, a(2) = 2, a(n) = 0 for n > 2.
%F A167891 G.f.: 1+4*x+2*x^2.
%o A167891 (PARI) {concat([1, 4, 2], vector(100))}
%Y A167891 Cf. A000004 (zero sequence), A028387 (n+(n+1)^2), A166926 (1, 2, 4, 0, 0, 0, 0, ...), A130706 (1, 2, 0, 0, 0, 0, ...), A130779 (1, 1, 2, 0, 0, 0, 0, ...), A167858 (3, 14, 36, 36, 12, 0, 0, 0, ...), A167876 (1, 3, 4, 2, 0, 0, 0, ...).
%K A167891 easy,nonn
%O A167891 0,2
%A A167891 _Klaus Brockhaus_, Nov 14 2009