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 | 15 |
| 2 | 275 |
| 3 | 5726 |
| 4 | 116166 |
| 5 | 2301877 |
| 6 | 45280509 |
| 7 | 889477656 |
| 8 | 17470103108 |
| 9 | 343131620201 |
| 10 | 6739543393711 |
| 11 | 132373673619692 |
| 12 | 2599998546891870 |
| 13 | 51067506790572861 |
| 14 | 1003035296281103375 |
| 15 | 19700977608538546036 |
| 16 | 386953998564799463776 |
| 17 | 7600302885548184827385 |
| 18 | 149280286962228069289683 |