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 | 6 |
| 3 | 27 |
| 4 | 170 |
| 5 | 1019 |
| 6 | 6945 |
| 7 | 50811 |
| 8 | 381332 |
| 9 | 2984194 |
| 10 | 23988173 |
| 11 | 196963369 |
| 12 | 1646209172 |
| 13 | 13964079652 |
| 14 | 119945656793 |
| 15 | 1041428920639 |
| 16 | 9126986454994 |
| 17 | 80644643655861 |
| 18 | 717727049224277 |