A207259 - cp's OEIS frontend

A207259 The number of 2 X 2 matrices with no real eigenvalues and whose entries are integers of absolute value at most n.

n	a(n)
1	14
2	148
3	642
4	1832
5	4246
6	8420
7	15202
8	25296
9	39742
10	59668
11	86338
12	120840
13	165174
14	220356
15	288322
16	370816
17	470254
18	587940
19	726994
20	888728
21	1076422
22	1292404
23	1539442
24	1819440
25	2136734
26	2493700
27	2893586
28	3339544
29	3835782
30	4384036
31	4990466
32	5656752
33	6388158

[14, 148, 642, 1832, 4246, 8420, 15202, 25296, 39742, 59668, 86338, 120840, 165174, 220356, 288322, 370816, 470254, 587940, 726994, 888728, 1076422, 1292404, 1539442, 1819440, 2136734, 2493700, 2893586, 3339544, 3835782, 4384036, 4990466, 5656752, 6388158]

cp's OEIS Frontend

A207259 The number of 2 X 2 matrices with no real eigenvalues and whose entries are integers of absolute value at most n.

Table of values

List of values