Number of 2 X 2 matrices having all elements in {0,1,...,n} and determinant in the open interval (-n,n).
A211032
Number of 2 X 2 matrices having all elements in {0,1,...,n} and determinant in the open interval (-n,n).
Terms
- a(0) =10a(1) =45a(2) =134a(3) =289a(4) =560a(5) =903a(6) =1476a(7) =2091a(8) =3014a(9) =4059a(10) =5456a(11) =6823a(12) =8994a(13) =10905a(14) =13434a(15) =16275a(16) =19740a(17) =22871a(18) =27440a(19) =31327a(20) =36778a(21) =42147a(22) =48176a(23) =53755a(24) =62164a(25) =69241a(26) =77466a(27) =86047a(28) =96474a(29) =105249
External references
- oeis: A211032