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.

A077854 Expansion of 1/((1-x)*(1-2*x)*(1+x^2)).

Table of values

n a(n)
0 1
1 3
2 6
3 12
4 25
5 51
6 102
7 204
8 409
9 819
10 1638
11 3276
12 6553
13 13107
14 26214
15 52428
16 104857
17 209715
18 419430
19 838860
20 1677721
21 3355443
22 6710886
23 13421772
24 26843545
25 53687091
26 107374182
27 214748364
28 429496729
29 858993459
30 1717986918
31 3435973836
32 6871947673

List of values

[1, 3, 6, 12, 25, 51, 102, 204, 409, 819, 1638, 3276, 6553, 13107, 26214, 52428, 104857, 209715, 419430, 838860, 1677721, 3355443, 6710886, 13421772, 26843545, 53687091, 107374182, 214748364, 429496729, 858993459, 1717986918, 3435973836, 6871947673]