cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A209984 Number of 2 X 2 matrices having all elements in {-n,...n} and determinant 2.

Table of values

n a(n)
0 0
1 4
2 92
3 156
4 284
5 412
6 604
7 796
8 1052
9 1244
10 1628
11 1948
12 2204
13 2588
14 3164
15 3420
16 3932
17 4444
18 5020
19 5596
20 6108
21 6492
22 7452
23 8156
24 8668
25 9308
26 10460
27 11036
28 11804
29 12700
30 13468
31 14428
32 15452
33 16092
34 17628
35 18396
36 19164
37 20316
38 22044

List of values

[0, 4, 92, 156, 284, 412, 604, 796, 1052, 1244, 1628, 1948, 2204, 2588, 3164, 3420, 3932, 4444, 5020, 5596, 6108, 6492, 7452, 8156, 8668, 9308, 10460, 11036, 11804, 12700, 13468, 14428, 15452, 16092, 17628, 18396, 19164, 20316, 22044]