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.

A114697 Expansion of (1+x+x^2)/((1-x^2)*(1-2*x-x^2)); a Pellian-related sequence.

Table of values

n a(n)
0 1
1 3
2 9
3 22
4 55
5 133
6 323
7 780
8 1885
9 4551
10 10989
11 26530
12 64051
13 154633
14 373319
15 901272
16 2175865
17 5253003
18 12681873
19 30616750
20 73915375
21 178447501
22 430810379
23 1040068260
24 2510946901
25 6061962063
26 14634871029
27 35331704122
28 85298279275
29 205928262673

List of values

[1, 3, 9, 22, 55, 133, 323, 780, 1885, 4551, 10989, 26530, 64051, 154633, 373319, 901272, 2175865, 5253003, 12681873, 30616750, 73915375, 178447501, 430810379, 1040068260, 2510946901, 6061962063, 14634871029, 35331704122, 85298279275, 205928262673]