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 | 1 |
| 2 | 2 |
| 3 | 5 |
| 4 | 16 |
| 5 | 62 |
| 6 | 274 |
| 7 | 1332 |
| 8 | 6978 |
| 9 | 38873 |
| 10 | 228090 |
| 11 | 1399625 |
| 12 | 8933506 |
| 13 | 59066261 |
| 14 | 403241292 |
| 15 | 2835267821 |
| 16 | 20490128048 |
| 17 | 151951503074 |
| 18 | 1154770194362 |
| 19 | 8983396031267 |
| 20 | 71473650532630 |
| 21 | 581142591346325 |
| 22 | 4825842125683150 |