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 | 3 |
| 3 | 9 |
| 4 | 34 |
| 5 | 125 |
| 6 | 459 |
| 7 | 1715 |
| 8 | 6432 |
| 9 | 24300 |
| 10 | 92375 |
| 11 | 352715 |
| 12 | 1352034 |
| 13 | 5200299 |
| 14 | 20058297 |
| 15 | 77558625 |
| 16 | 300540160 |
| 17 | 1166803109 |
| 18 | 4537567188 |
| 19 | 17672631899 |
| 20 | 68923264250 |
| 21 | 269128935495 |
| 22 | 1052049481857 |
| 23 | 4116715363799 |
| 24 | 16123801834656 |