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.

A060897 Number of walks of length n on square lattice, starting at origin, staying in first and third quadrants.

Table of values

n a(n)
0 1
1 4
2 12
3 44
4 144
5 528
6 1808
7 6676
8 23536
9 87568
10 315136
11 1180680
12 4314560
13 16263896
14 60138816
15 227899484
16 850600944
17 3238194560
18 12177384544
19 46542879384
20 176110444736
21 675431779856
22 2568878867200
23 9882068082112
24 37747540858240
25 145593279888736
26 558190182662144

List of values

[1, 4, 12, 44, 144, 528, 1808, 6676, 23536, 87568, 315136, 1180680, 4314560, 16263896, 60138816, 227899484, 850600944, 3238194560, 12177384544, 46542879384, 176110444736, 675431779856, 2568878867200, 9882068082112, 37747540858240, 145593279888736, 558190182662144]