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

1, 1, 11, 420, 41451, 7985639, 2779152652

Offset: 0

Author

Stefano Spezia, Feb 14 2022

Keywords

• nonn
• hard
• more

Examples

			a(3) = 420:
    1    5    6
    5    3    4
    6    4    2
a(4) = 41451:
    1    5    8   10
    5    4    9    7
    8    9    3    6
   10    7    6    2
		

Crossrefs

Cf. A000217, A351153, A351610 (minimal).

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

Extensions

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