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 A232620 #20 Dec 22 2024 10:33:32 %S A232620 4,615,9090,11011 %N A232620 Numbers k such that (2k)!! mod (2k-1)!! is greater than (2k+2)!! mod (2k+1)!!. %C A232620 Numbers k such that A232618(k) > A232618(k+1). %C A232620 a(5) > 10 * 2^20. %e A232620 4 is in the sequence because A232618(4) > A232618(5). %o A232620 (Python) %o A232620 o=e=1 # odd, even %o A232620 prev=0 %o A232620 for n in range(1,1000000000,2): %o A232620 o*=n %o A232620 e*=n+1 %o A232620 cur = e%o %o A232620 if prev>cur: print(str(n//2), end=', ') %o A232620 prev=cur %Y A232620 Cf. A006882, A232618. %K A232620 nonn,hard,more %O A232620 1,1 %A A232620 _Alex Ratushnyak_, Nov 27 2013