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) |
|---|---|
| 0 | 1 |
| 1 | 10 |
| 2 | 54 |
| 3 | 210 |
| 4 | 659 |
| 5 | 1772 |
| 6 | 4235 |
| 7 | 9218 |
| 8 | 18590 |
| 9 | 35178 |
| 10 | 63064 |
| 11 | 107910 |
| 12 | 177297 |
| 13 | 281060 |
| 14 | 431598 |
| 15 | 644136 |
| 16 | 936915 |
| 17 | 1331286 |
| 18 | 1851685 |
| 19 | 2525468 |
| 20 | 3382588 |
| 21 | 4455100 |
| 22 | 5776486 |
| 23 | 7380800 |
| 24 | 9301642 |
| 25 | 11570980 |
| 26 | 14217849 |
| 27 | 17266966 |
| 28 | 20737309 |
| 29 | 24640716 |
| 30 | 28980565 |