A211156 - cp's OEIS frontend

A211156 Number of 2 X 2 matrices having all terms in {-n,...,0,..,n} and even nonnegative determinant.

n	a(n)
1	37
2	293
3	817
4	2513
5	4677
6	10149
7	15873
8	28545
9	40581
10	65093
11	86769
12	128977
13	164581
14	231173
15	285953
16	385153
17	464357
18	605477
19	715889
20	909201
21	1058501
22	1315237
23	1510721
24	1844289
25	2095429

[37, 293, 817, 2513, 4677, 10149, 15873, 28545, 40581, 65093, 86769, 128977, 164581, 231173, 285953, 385153, 464357, 605477, 715889, 909201, 1058501, 1315237, 1510721, 1844289, 2095429]

cp's OEIS Frontend

A211156 Number of 2 X 2 matrices having all terms in {-n,...,0,..,n} and even nonnegative determinant.

Table of values

List of values