A330134 Number of n X n (-1,0,1)-matrices with zero permanent.
1, 33, 7555, 13482049, 186481694371, 19733690332538577
Offset: 1
Links
- Code Golf Stack Exchange, Find the number of n-by-n (-1, 0, 1) matrices with zero permanent as quickly as possible
Programs
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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