A211158 - cp's OEIS frontend

A211158 Number of 2 X 2 matrices having all terms in {-n,...,0,..,n} and positive odd determinant.

n	a(n)
1	20
2	84
3	528
4	1040
5	3060
6	4788
7	10304
8	14400
9	26100
10	34100
11	55440
12	69264
13	104468
14	126420
15	180480
16	213248
17	291924
18	338580
19	448400
20	512400
21	660660
22	745844
23	940608
24	1051200
25	1301300
26	1441908
27	1756944
28	1932560
29	2322900
30	2538900
31	3015680
32	3277824
33	3852948
34	4167380

[20, 84, 528, 1040, 3060, 4788, 10304, 14400, 26100, 34100, 55440, 69264, 104468, 126420, 180480, 213248, 291924, 338580, 448400, 512400, 660660, 745844, 940608, 1051200, 1301300, 1441908, 1756944, 1932560, 2322900, 2538900, 3015680, 3277824, 3852948, 4167380]

cp's OEIS Frontend

A211158 Number of 2 X 2 matrices having all terms in {-n,...,0,..,n} and positive odd determinant.

Table of values

List of values