A211152 - cp's OEIS frontend

A211152 Number of 2 X 2 matrices having all terms in {-n,...,0,...,n} and determinant >= 2n.

n	a(n)
1	4
2	80
3	428
4	1428
5	3604
6	7924
7	14988
8	26244
9	43072
10	66844
11	98804
12	142652
13	197584
14	268800
15	357608
16	465888
17	596964
18	756036
19	942160
20	1163608
21	1420248
22	1717344
23	2056952
24	2451248
25	2891420
26	3392528
27	3958576

[4, 80, 428, 1428, 3604, 7924, 14988, 26244, 43072, 66844, 98804, 142652, 197584, 268800, 357608, 465888, 596964, 756036, 942160, 1163608, 1420248, 1717344, 2056952, 2451248, 2891420, 3392528, 3958576]

cp's OEIS Frontend

A211152 Number of 2 X 2 matrices having all terms in {-n,...,0,...,n} and determinant >= 2n.

Table of values

List of values