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) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 17 |
| 3 | 146 |
| 4 | 1668 |
| 5 | 23834 |
| 6 | 408614 |
| 7 | 8173248 |
| 8 | 186836952 |
| 9 | 4804906656 |
| 10 | 137297982672 |
| 11 | 4315550336448 |
| 12 | 147977856835440 |
| 13 | 5496919791479856 |
| 14 | 219900767818247952 |
| 15 | 9425346313165808064 |
| 16 | 430919959212816772608 |
| 17 | 20932680398362302305664 |