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.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 10 |
| 3 | 120 |
| 4 | 2211 |
| 5 | 10011 |
| 6 | 112101 |
| 7 | 2001000 |
| 8 | 10006101 |
| 9 | 200010000 |
| 10 | 1210000221 |
| 11 | 20000100000 |
| 12 | 210010000005 |
| 13 | 2000001000000 |
| 14 | 32000004000000 |
| 15 | 200000010000000 |
| 16 | 3200000040000000 |
| 17 | 20000000100000000 |
| 18 | 320000000400000000 |
| 19 | 2000000001000000000 |
| 20 | 32000000004000000000 |