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 | 12 |
| 2 | 144 |
| 3 | 889 |
| 4 | 7675 |
| 5 | 63866 |
| 6 | 502864 |
| 7 | 4108471 |
| 8 | 33311703 |
| 9 | 269021206 |
| 10 | 2180747052 |
| 11 | 17657728229 |
| 12 | 142945674729 |
| 13 | 1157610400394 |
| 14 | 9373284938378 |
| 15 | 75896278735065 |
| 16 | 614558095591053 |
| 17 | 4976204942982610 |
| 18 | 40293442480994080 |
| 19 | 326265843009762463 |