cp's OEIS Frontend

A351610 Minimal permanent of an n X n symmetric matrix using the integers 1 to n*(n + 1)/2.

%I A351610 #6 Feb 15 2022 16:05:28
%S A351610 1,1,7,163,9850,1243806,284995981
%N A351610 Minimal permanent of an n X n symmetric matrix using the integers 1 to n*(n + 1)/2.
%e A351610 a(3) = 163:
%e A351610    1    2    3
%e A351610    2    5    4
%e A351610    3    4    6
%e A351610 a(4) = 9850:
%e A351610    1    2    3    4
%e A351610    2    8    5    6
%e A351610    3    5    9    7
%e A351610    4    6    7   10
%Y A351610 Cf. A000217, A351153, A351611 (maximal).
%Y A351610 Cf. A350565, A350858, A350937, A350939, A351019, A351021.
%K A351610 nonn,hard,more
%O A351610 0,3
%A A351610 _Stefano Spezia_, Feb 14 2022
%E A351610 a(5)-a(6) from _Hugo Pfoertner_, Feb 15 2022