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 | 21 |
| 4 | 120 |
| 5 | 210 |
| 6 | 2211 |
| 7 | 10011 |
| 8 | 20100 |
| 9 | 112101 |
| 10 | 222111 |
| 11 | 2001000 |
| 12 | 22221111 |
| 13 | 110120220 |
| 14 | 122000010 |
| 15 | 200010000 |
| 16 | 1210000221 |
| 17 | 2222211111 |
| 18 | 12001110201 |
| 19 | 20000100000 |
| 20 | 122021211021 |
| 21 | 222222111111 |
| 22 | 2000001000000 |
| 23 | 12201101000011 |
| 24 | 22222221111111 |
| 25 | 200000010000000 |