A081473 - OEIS

%I #8 Sep 03 2023 10:40:45

%S 2,4,8,16,44,194,946

%N Smallest positive even number not the permanent of a real singular (0,1)-matrix of order n.

%e 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 Cf. A089477.

%K hard,more,nonn

%O 1,1

%A _Jaap Spies_, Nov 25 2003

%E a(7) from _Max Alekseyev_, Sep 03 2023