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 | 0 |
| 1 | 1 |
| 2 | 21 |
| 3 | 331 |
| 4 | 4641 |
| 5 | 61051 |
| 6 | 771561 |
| 7 | 9487171 |
| 8 | 114358881 |
| 9 | 1357947691 |
| 10 | 15937424601 |
| 11 | 185311670611 |
| 12 | 2138428376721 |
| 13 | 24522712143931 |
| 14 | 279749833583241 |
| 15 | 3177248169415651 |
| 16 | 35949729863572161 |
| 17 | 405447028499293771 |