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 A309956 #15 Sep 08 2022 08:46:22
%S A309956 0,1,2,3,4,0,1,2,3,4,0,2,4,6,8,0,3,6,9,12,0,4,8,12,16,0,0,0,0,0,0,1,2,
%T A309956 3,4,0,2,4,6,8,0,3,6,9,12,0,4,8,12,16,0,0,0,0,0,0,2,4,6,8,0,4,8,12,16,
%U A309956 0,6,12,18,24,0,8,16,24,32,0,0,0,0,0,0,3,6,9,12,0,6,12,18,24,0,9,18,27,36,0,12,24,36,48,0
%N A309956 Product of digits of (n written in base 5).
%H A309956 Seiichi Manyama, <a href="/A309956/b309956.txt">Table of n, a(n) for n = 0..10000</a>
%F A309956 G.f. A(x) satisfies: A(x) = x * (1 + 2*x + 3*x^2 + 4*x^3) * (1 + A(x^5)).
%t A309956 Table[Times @@ IntegerDigits[n, 5], {n, 0, 100}]
%o A309956 (PARI) a(n) = my(d = if (n, digits(n,5), [0])); vecprod(d); \\ _Michel Marcus_, Aug 25 2019
%o A309956 (Magma) [0] cat [&*Intseq(n,5):n in [1..100]]; // _Marius A. Burtea_, Aug 25 2019
%Y A309956 Cf. A007091, A007954, A053824.
%K A309956 nonn,base,look
%O A309956 0,3
%A A309956 _Ilya Gutkovskiy_, Aug 24 2019