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 | 14 |
| 5 | 40 |
| 6 | 128 |
| 7 | 369 |
| 8 | 1214 |
| 9 | 3516 |
| 10 | 12776 |
| 11 | 40534 |
| 12 | 137404 |
| 13 | 463232 |
| 14 | 1602348 |
| 15 | 5216253 |
| 16 | 17753898 |
| 17 | 58597316 |
| 18 | 212150928 |
| 19 | 710453534 |
| 20 | 2366853608 |
| 21 | 8584498376 |
| 22 | 30026959300 |
| 23 | 100396304016 |
| 24 | 333997297900 |
| 25 | 1157269900344 |
| 26 | 3852364562536 |
| 27 | 13917848281928 |
| 28 | 45618032373712 |