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 A358991 #5 Dec 11 2022 12:01:19
%S A358991 0,0,0,0,0,1,1,0,0,0,0,0,1,2,1,0,2,1,1,2,2,3,2,2,2,3,2,4,5,2,4,1,3,4,
%T A358991 5,6,9,5,4,6,4,7,7,10,5,7,10,8,9,8,4,7,4,15,9,4,7,12,9,8,14,12,5,14,
%U A358991 12,6,11,10,14,17,17,11,19,11,15,19,15,13,14,11,19
%N A358991 a(n) is the number of zero digits in the product of the first n odd numbers not divisible by 5.
%F A358991 a(n) = A055641(A356990(n)).
%t A358991 Table[Count[IntegerDigits[Product[2i+2Floor[(i-3)/4]+1, {i, n}]], 0], {n, 0, 80}]
%Y A358991 Cf. A045572, A055641, A356859, A358990.
%Y A358991 Cf. A358992 (number of digits), A358993 (number of nonzero digits).
%K A358991 nonn,base
%O A358991 0,14
%A A358991 _Stefano Spezia_, Dec 09 2022