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 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 0 |
| 8 | 5 |
| 9 | 31 |
| 10 | 185 |
| 11 | 947 |
| 12 | 4564 |
| 13 | 21004 |
| 14 | 93833 |
| 15 | 410295 |
| 16 | 1765378 |
| 17 | 7504024 |
| 18 | 31591157 |
| 19 | 131982937 |
| 20 | 547971412 |
| 21 | 2263443059 |
| 22 | 9309302775 |
| 23 | 38149945673 |
| 24 | 155858903955 |
| 25 | 635066943350 |
| 26 | 2581736396181 |