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 | 1 |
| 3 | 4 |
| 4 | 11 |
| 5 | 38 |
| 6 | 151 |
| 7 | 655 |
| 8 | 3112 |
| 9 | 16000 |
| 10 | 88285 |
| 11 | 519592 |
| 12 | 3244512 |
| 13 | 21400146 |
| 14 | 148530179 |
| 15 | 1081222613 |
| 16 | 8231314455 |
| 17 | 65369494593 |
| 18 | 540322688516 |
| 19 | 4639020151529 |
| 20 | 41295634331020 |
| 21 | 380514484523095 |
| 22 | 3623898600072459 |
| 23 | 35622399584611476 |
| 24 | 360965731323718242 |