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 | 429 |
| 1 | 1001 |
| 2 | 3003 |
| 3 | 9646 |
| 4 | 32123 |
| 5 | 109550 |
| 6 | 380162 |
| 7 | 1337220 |
| 8 | 4755402 |
| 9 | 17065365 |
| 10 | 61714147 |
| 11 | 224661206 |
| 12 | 822574599 |
| 13 | 3027096930 |
| 14 | 11190101910 |
| 15 | 41532876060 |
| 16 | 154712622870 |
| 17 | 578210935770 |
| 18 | 2167431271614 |
| 19 | 8146882131276 |