Number of n x n permutation matrices that disconnect their zeros.
A217447
Number of n x n permutation matrices that disconnect their zeros.
Terms
- a(0) =2a(1) =6a(2) =12a(3) =32a(4) =120a(5) =580a(6) =3392a(7) =23244a(8) =182776a(9) =1622468a(10) =16045200a(11) =174894172a(12) =2082824744a(13) =26902998516a(14) =374570250688
External references
- oeis: A217447