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 | 1 |
| 2 | 19 |
| 3 | 379 |
| 4 | 7561 |
| 5 | 150841 |
| 6 | 3009259 |
| 7 | 60034339 |
| 8 | 1197677521 |
| 9 | 23893516081 |
| 10 | 476672644099 |
| 11 | 9509559365899 |
| 12 | 189714514673881 |
| 13 | 3784780734111721 |
| 14 | 75505900167560539 |
| 15 | 1506333222617099059 |
| 16 | 30051158552174420641 |
| 17 | 599516837820871313761 |
| 18 | 11960285597865251854579 |