A211146 - cp's OEIS frontend

A211146 Number of 2 X 2 matrices having all terms in {-n,...,0,...,n} and 0 <= determinant <= n.

n	a(n)
0	1
1	53
2	273
3	737
4	1613
5	2821
6	4853
7	7125
8	10593
9	14597
10	19885
11	25309
12	33677
13	41189
14	51269
15	62565
16	76145
17	88793
18	106821
19	122581
20	144541
21	166045
22	189997
23	212877
24	246653
25	275081
26	308369
27	343281
28	384977
29	421097
30	472649
31	513865
32	567765

[1, 53, 273, 737, 1613, 2821, 4853, 7125, 10593, 14597, 19885, 25309, 33677, 41189, 51269, 62565, 76145, 88793, 106821, 122581, 144541, 166045, 189997, 212877, 246653, 275081, 308369, 343281, 384977, 421097, 472649, 513865, 567765]

cp's OEIS Frontend

A211146 Number of 2 X 2 matrices having all terms in {-n,...,0,...,n} and 0 <= determinant <= n.

Table of values

List of values