A211068 - cp's OEIS frontend

A211068 Number of 2 X 2 matrices having all terms in {1,...,n} and positive odd determinant.

n	a(n)
1	0
2	3
3	20
4	48
5	144
6	243
7	528
8	768
9	1400
10	1875
11	3060
12	3888
13	5880
14	7203
15	10304
16	12288
17	16848
18	19683
19	26100
20	30000
21	38720
22	43923
23	55440
24	62208
25	77064
26	85683
27	104468
28	115248
29	138600
30	151875
31	180480
32	196608
33	231200
34	250563
35	291924

[0, 3, 20, 48, 144, 243, 528, 768, 1400, 1875, 3060, 3888, 5880, 7203, 10304, 12288, 16848, 19683, 26100, 30000, 38720, 43923, 55440, 62208, 77064, 85683, 104468, 115248, 138600, 151875, 180480, 196608, 231200, 250563, 291924]

cp's OEIS Frontend

A211068 Number of 2 X 2 matrices having all terms in {1,...,n} and positive odd determinant.

Table of values

List of values