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

1, 1, 7, 163, 9850, 1243806, 284995981

Offset: 0

Author

Stefano Spezia, Feb 14 2022

Keywords

• nonn
• hard
• more

Examples

			a(3) = 163:
   1    2    3
   2    5    4
   3    4    6
a(4) = 9850:
   1    2    3    4
   2    8    5    6
   3    5    9    7
   4    6    7   10
		

Crossrefs

Cf. A000217, A351153, A351611 (maximal).

Cf. A350565, A350858, A350937, A350939, A351019, A351021.

Extensions

a(5)-a(6) from Hugo Pfoertner, Feb 15 2022