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) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 17 |
| 4 | 202 |
| 5 | 1397 |
| 6 | 6582 |
| 7 | 24185 |
| 8 | 73496 |
| 9 | 195086 |
| 10 | 463875 |
| 11 | 1013505 |
| 12 | 2061426 |
| 13 | 3956947 |
| 14 | 7222992 |
| 15 | 12640817 |
| 16 | 21312992 |
| 17 | 34801420 |
| 18 | 55215621 |
| 19 | 85424721 |
| 20 | 129174250 |
| 21 | 191397185 |
| 22 | 278361226 |
| 23 | 398108777 |
| 24 | 560635032 |
| 25 | 778491962 |
| 26 | 1066995527 |
| 27 | 1445034305 |
| 28 | 1935301746 |
| 29 | 2565356031 |
| 30 | 3367870500 |