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 A081473 #8 Sep 03 2023 10:40:45 %S A081473 2,4,8,16,44,194,946 %N A081473 Smallest positive even number not the permanent of a real singular (0,1)-matrix of order n. %e A081473 a(4) = 16, see permanent frequency table: (0,27713), (2,9360), (4,3582), (6,1248), (8,648), (10,288), (12,48), (14,72), (18,16), (24,1). %Y A081473 Cf. A089477. %K A081473 hard,more,nonn %O A081473 1,1 %A A081473 _Jaap Spies_, Nov 25 2003 %E A081473 a(7) from _Max Alekseyev_, Sep 03 2023