A211148 - cp's OEIS frontend

A211148 Number of 2 X 2 matrices having all terms in {-n,...,0,..,n} and positive determinant.

n	a(n)
1	24
2	248
3	1056
4	3008
5	6904
6	13624
7	24448
8	40576
9	63640
10	95288
11	137632
12	192384
13	262392
14	349688
15	457088
16	587520
17	744344
18	930104
19	1149152
20	1404160
21	1699640
22	2039544
23	2428352
24	2869312
25	3368472
26	3929912
27	4558688
28	5259712
29	6039480

[24, 248, 1056, 3008, 6904, 13624, 24448, 40576, 63640, 95288, 137632, 192384, 262392, 349688, 457088, 587520, 744344, 930104, 1149152, 1404160, 1699640, 2039544, 2428352, 2869312, 3368472, 3929912, 4558688, 5259712, 6039480]

cp's OEIS Frontend

A211148 Number of 2 X 2 matrices having all terms in {-n,...,0,..,n} and positive determinant.

Table of values

List of values