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.

A052899 Expansion of g.f.: (1-2*x) / ((x-1)*(4*x^2+2*x-1)).

Table of values

n a(n)
0 1
1 1
2 5
3 13
4 45
5 141
6 461
7 1485
8 4813
9 15565
10 50381
11 163021
12 527565
13 1707213
14 5524685
15 17878221
16 57855181
17 187223245
18 605867213
19 1960627405
20 6344723661
21 20531956941
22 66442808525
23 215013444813
24 695798123725
25 2251650026701
26 7286492548301
27 23579585203405
28 76305140600013

List of values

[1, 1, 5, 13, 45, 141, 461, 1485, 4813, 15565, 50381, 163021, 527565, 1707213, 5524685, 17878221, 57855181, 187223245, 605867213, 1960627405, 6344723661, 20531956941, 66442808525, 215013444813, 695798123725, 2251650026701, 7286492548301, 23579585203405, 76305140600013]