a(n) is the number of 2 X 2 matrices over the integers mod n that are invertible mod n for every permutation of their elements.
A367926
a(n) is the number of 2 X 2 matrices over the integers mod n that are invertible mod n for every permutation of their elements.
Terms
- a(0) =4a(1) =40a(2) =64a(3) =400a(4) =160a(5) =1704a(6) =1024a(7) =3240a(8) =1600a(9) =11560a(10) =2560a(11) =23280a(12) =6816a(13) =16000a(14) =16384a(15) =71104a(16) =12960a(17) =112680a(18) =25600a(19) =68160a(20) =46240a(21) =247720a(22) =40960a(23) =250000a(24) =93120a(25) =262440a(26) =109056a(27) =641200a(28) =64000a(29) =842280
External references
- oeis: A367926