A211154 - cp's OEIS frontend

A211154 Number of 2 X 2 matrices having all terms in {-n,...,0,..,n} and even determinant.

n	a(n)
0	1
1	41
2	457
3	1345
4	4481
5	8521
6	18985
7	30017
8	54721
9	78121
10	126281
11	168961
12	252097
13	322505
14	454441
15	562561
16	759425
17	916777
18	1197001
19	1416641
20	1800961
21	2097481
22	2608937
23	2998465
24	3662401
25	4162601
26	5006665
27	5636737
28	6690881
29	7471561
30	8768041
31	9721601
32	11294977
33	12445225
34	14332361
35	15704641

[1, 41, 457, 1345, 4481, 8521, 18985, 30017, 54721, 78121, 126281, 168961, 252097, 322505, 454441, 562561, 759425, 916777, 1197001, 1416641, 1800961, 2097481, 2608937, 2998465, 3662401, 4162601, 5006665, 5636737, 6690881, 7471561, 8768041, 9721601, 11294977, 12445225, 14332361, 15704641]

cp's OEIS Frontend

A211154 Number of 2 X 2 matrices having all terms in {-n,...,0,..,n} and even determinant.

Table of values

List of values