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.

A210372 Number of 2 X 2 matrices with all elements in {0,1,...,n} and positive even determinant.

Table of values

n a(n)
0 0
1 0
2 17
3 48
4 172
5 320
6 713
7 1112
8 2016
9 2840
10 4561
11 6056
12 8964
13 11400
14 15977
15 19648
16 26400
17 31744
18 41257
19 48664
20 61620
21 71512
22 88689
23 101680
24 123800
25 140376
26 168449
27 189232
28 224108
29 249840
30 292545

List of values

[0, 0, 17, 48, 172, 320, 713, 1112, 2016, 2840, 4561, 6056, 8964, 11400, 15977, 19648, 26400, 31744, 41257, 48664, 61620, 71512, 88689, 101680, 123800, 140376, 168449, 189232, 224108, 249840, 292545]