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 | 16 |
| 3 | 151 |
| 4 | 1051 |
| 5 | 7072 |
| 6 | 52189 |
| 7 | 387961 |
| 8 | 2803408 |
| 9 | 20262175 |
| 10 | 147578083 |
| 11 | 1074220864 |
| 12 | 7803627829 |
| 13 | 56703899473 |
| 14 | 412249980976 |
| 15 | 2996844053479 |
| 16 | 21782472167851 |
| 17 | 158330928308704 |
| 18 | 1150906042354381 |
| 19 | 8365826645067625 |
| 20 | 60809849516721040 |