A330134 Number of n X n (-1,0,1)-matrices with zero permanent.

1, 33, 7555, 13482049, 186481694371, 19733690332538577

Offset: 1

Author

Hongyang Cao, Dec 02 2019

Keywords

• nonn
• more
• hard

Links

• Code Golf Stack Exchange, Find the number of n-by-n (-1, 0, 1) matrices with zero permanent as quickly as possible

Crossrefs

Cf. A088672, A057981.

Programs

Mathematica

a[n_] := Sum[Boole[Permanent[m] == 0], {m, Tuples[{-1, 0, 1}, {n, n}]}];

Extensions

a(6) from Peter J. Taylor, Dec 16 2019