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 | 1112 |
| 4 | 7878 |
| 5 | 59812 |
| 6 | 467146 |
| 7 | 3619683 |
| 8 | 27856426 |
| 9 | 214439388 |
| 10 | 1653053388 |
| 11 | 12745491312 |
| 12 | 98247659290 |
| 13 | 757270935480 |
| 14 | 5837067310185 |
| 15 | 44993325501460 |
| 16 | 346816977981142 |
| 17 | 2673316454328453 |
| 18 | 20606310351329382 |
| 19 | 158836581856928905 |