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 | 3 |
| 3 | 19 |
| 4 | 310 |
| 5 | 10978 |
| 6 | 868140 |
| 7 | 149688297 |
| 8 | 57339888914 |
| 9 | 49349265481439 |
| 10 | 97121874114574056 |
| 11 | 443452539940740460176 |
| 12 | 4761916627762078978228971 |
| 13 | 121633155493441873035613043864 |
| 14 | 7462643123890754031039350760255218 |