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 | 908 |
| 4 | 5711 |
| 5 | 32204 |
| 6 | 181557 |
| 7 | 1001368 |
| 8 | 5521489 |
| 9 | 30306759 |
| 10 | 166323490 |
| 11 | 911899467 |
| 12 | 4999341631 |
| 13 | 27402344925 |
| 14 | 150194353126 |
| 15 | 823189068247 |
| 16 | 4511728088822 |
| 17 | 24727593668449 |
| 18 | 135525199872089 |
| 19 | 742775009335794 |