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.

A115451 Expansion of 1/((1+x)*(1-2*x)*(1+x^2)).

Table of values

n a(n)
0 1
1 1
2 2
3 4
4 9
5 17
6 34
7 68
8 137
9 273
10 546
11 1092
12 2185
13 4369
14 8738
15 17476
16 34953
17 69905
18 139810
19 279620
20 559241
21 1118481
22 2236962
23 4473924
24 8947849
25 17895697
26 35791394
27 71582788
28 143165577
29 286331153
30 572662306
31 1145324612
32 2290649225
33 4581298449
34 9162596898

List of values

[1, 1, 2, 4, 9, 17, 34, 68, 137, 273, 546, 1092, 2185, 4369, 8738, 17476, 34953, 69905, 139810, 279620, 559241, 1118481, 2236962, 4473924, 8947849, 17895697, 35791394, 71582788, 143165577, 286331153, 572662306, 1145324612, 2290649225, 4581298449, 9162596898]