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 | 9 |
| 2 | 155 |
| 3 | 2861 |
| 4 | 52817 |
| 5 | 972557 |
| 6 | 17892281 |
| 7 | 329097125 |
| 8 | 6052932495 |
| 9 | 111328274273 |
| 10 | 2047599783121 |
| 11 | 37660384283749 |
| 12 | 692666924307063 |
| 13 | 12739845501187821 |
| 14 | 234317040993180833 |
| 15 | 4309665744385061493 |
| 16 | 79265335342431559977 |