A209990 - cp's OEIS frontend

A209990 Number of 2 X 2 matrices having all elements in {-n,...n} and determinant 5.

n	a(n)
0	0
1	0
2	8
3	64
4	128
5	408
6	472
7	664
8	792
9	984
10	1272
11	1592
12	1720
13	2104
14	2296
15	2872
16	3128
17	3640
18	3832
19	4408
20	4984
21	5368
22	5688
23	6392
24	6648
25	7928
26	8312
27	8888
28	9272
29	10168
30	10744
31	11704
32	12216
33	12856
34	13368
35	15096
36	15480
37	16632
38	17208
39	17976

[0, 0, 8, 64, 128, 408, 472, 664, 792, 984, 1272, 1592, 1720, 2104, 2296, 2872, 3128, 3640, 3832, 4408, 4984, 5368, 5688, 6392, 6648, 7928, 8312, 8888, 9272, 10168, 10744, 11704, 12216, 12856, 13368, 15096, 15480, 16632, 17208, 17976]

cp's OEIS Frontend

A209990 Number of 2 X 2 matrices having all elements in {-n,...n} and determinant 5.

Table of values

List of values