cp's OEIS Frontend

A351611 Maximal permanent of an n X n symmetric matrix using the integers 1 to n*(n + 1)/2.

%I A351611 #6 Feb 15 2022 16:05:46
%S A351611 1,1,11,420,41451,7985639,2779152652
%N A351611 Maximal permanent of an n X n symmetric matrix using the integers 1 to n*(n + 1)/2.
%e A351611 a(3) = 420:
%e A351611     1    5    6
%e A351611     5    3    4
%e A351611     6    4    2
%e A351611 a(4) = 41451:
%e A351611     1    5    8   10
%e A351611     5    4    9    7
%e A351611     8    9    3    6
%e A351611    10    7    6    2
%Y A351611 Cf. A000217, A351153, A351610 (minimal).
%Y A351611 Cf. A350566, A350859, A350938, A350940, A351020, A351022.
%K A351611 nonn,hard,more
%O A351611 0,3
%A A351611 _Stefano Spezia_, Feb 14 2022
%E A351611 a(5)-a(6) from _Hugo Pfoertner_, Feb 15 2022