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 A309887 #14 Aug 02 2020 15:33:15 %S A309887 1,3,0,1,1,0,0,1,2,3,0,2,0,2,3,0,2,0,3,1,2,2,1,0,2,2,3,0,3,2,2,3,0,2, %T A309887 1,0,0,0,2,3,0,2,0,0,3,3,3,1,3,0,2,2,3,3,3,1,0,3,1,2,0,0,2,3,3,1,1,0, %U A309887 2,1,3,2,1,1,0,1,2,3,2,3,1,1,2,2,0,3,3,0,1,1,1,2,0,1,3,0,2,2,0,3 %N A309887 Coefficients of 4-adic expansion of exp(4). %H A309887 Robert Israel, <a href="/A309887/b309887.txt">Table of n, a(n) for n = 0..9999</a> %p A309887 op([1,3],padic:-evalp(exp(4),4,100)); # _Robert Israel_, Aug 02 2020 %o A309887 (PARI) N=100; Vecrev(digits(lift(exp(4+O(2^(2*N)))), 4), N) %Y A309887 k-adic expansion of exp(k): A317675 (k=3), this sequence (k=4), A309888 (k=5). %Y A309887 Cf. A092426. %K A309887 nonn,base %O A309887 0,2 %A A309887 _Seiichi Manyama_, Aug 21 2019