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) |
|---|---|
| 1 | 2 |
| 2 | 15 |
| 3 | 120 |
| 4 | 1190 |
| 5 | 14595 |
| 6 | 215950 |
| 7 | 3761310 |
| 8 | 75550188 |
| 9 | 1721103648 |
| 10 | 43872089118 |
| 11 | 1237592664451 |
| 12 | 38282002057156 |
| 13 | 1288537309627464 |
| 14 | 46886217384094764 |
| 15 | 1834003542264708444 |
| 16 | 76744318019878844916 |
| 17 | 3420833746251201921980 |