A280056 - cp's OEIS frontend

A280056 Number of 2 X 2 matrices with entries in {0,1,...,n} and even trace with no entries repeated.

n	a(n)
0	0
1	0
2	0
3	8
4	48
5	144
6	360
7	720
8	1344
9	2240
10	3600
11	5400
12	7920
13	11088
14	15288
15	20384
16	26880
17	34560
18	44064
19	55080
20	68400
21	83600
22	101640
23	121968
24	145728
25	172224
26	202800
27	236600
28	275184
29	317520
30	365400
31	417600
32	476160
33	539648
34	610368
35	686664
36	771120
37	861840
38	961704
39	1068560
40	1185600

[0, 0, 0, 8, 48, 144, 360, 720, 1344, 2240, 3600, 5400, 7920, 11088, 15288, 20384, 26880, 34560, 44064, 55080, 68400, 83600, 101640, 121968, 145728, 172224, 202800, 236600, 275184, 317520, 365400, 417600, 476160, 539648, 610368, 686664, 771120, 861840, 961704, 1068560, 1185600]

cp's OEIS Frontend

A280056 Number of 2 X 2 matrices with entries in {0,1,...,n} and even trace with no entries repeated.

Table of values

List of values