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 | 31 |
| 3 | 61 |
| 4 | 991 |
| 5 | 2821 |
| 6 | 32551 |
| 7 | 117181 |
| 8 | 1093711 |
| 9 | 4609141 |
| 10 | 37420471 |
| 11 | 175694701 |
| 12 | 1298308831 |
| 13 | 6569149861 |
| 14 | 45518414791 |
| 15 | 242592910621 |
| 16 | 1608145354351 |
| 17 | 8885932672981 |
| 18 | 57130293303511 |
| 19 | 323708273492941 |
| 20 | 2037617072598271 |