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) |
|---|---|
| 2 | 1 |
| 3 | 1 |
| 4 | 3 |
| 5 | 6 |
| 6 | 17 |
| 7 | 44 |
| 8 | 133 |
| 9 | 404 |
| 10 | 1319 |
| 11 | 4392 |
| 12 | 15114 |
| 13 | 52796 |
| 14 | 187410 |
| 15 | 671848 |
| 16 | 2430509 |
| 17 | 8852584 |
| 18 | 32438603 |
| 19 | 119463056 |
| 20 | 441926206 |
| 21 | 1641246060 |
| 22 | 6117011262 |
| 23 | 22871513128 |
| 24 | 85766691938 |
| 25 | 322479555096 |
| 26 | 1215493792902 |
| 27 | 4591852445104 |
| 28 | 17383416640308 |
| 29 | 65937045017304 |