A351611 - OEIS

%I #6 Feb 15 2022 16:05:46

%S 1,1,11,420,41451,7985639,2779152652

%N Maximal permanent of an n X n symmetric matrix using the integers 1 to n*(n + 1)/2.

%e a(3) = 420:

%e     1    5    6

%e     5    3    4

%e     6    4    2

%e a(4) = 41451:

%e     1    5    8   10

%e     5    4    9    7

%e     8    9    3    6

%e    10    7    6    2

%Y Cf. A000217, A351153, A351610 (minimal).

%Y Cf. A350566, A350859, A350938, A350940, A351020, A351022.

%K nonn,hard,more

%O 0,3

%A _Stefano Spezia_, Feb 14 2022

%E a(5)-a(6) from _Hugo Pfoertner_, Feb 15 2022