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 | 3 |
| 2 | 12 |
| 3 | 47 |
| 4 | 183 |
| 5 | 714 |
| 6 | 2785 |
| 7 | 10863 |
| 8 | 42372 |
| 9 | 165275 |
| 10 | 644667 |
| 11 | 2514570 |
| 12 | 9808261 |
| 13 | 38257827 |
| 14 | 149227404 |
| 15 | 582072215 |
| 16 | 2270414511 |
| 17 | 8855914986 |
| 18 | 34543132921 |
| 19 | 134737972743 |
| 20 | 525555146964 |
| 21 | 2049965624963 |
| 22 | 7996038261267 |
| 23 | 31189121952618 |
| 24 | 121655411891581 |
| 25 | 474525678055131 |