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 | 0 |
| 2 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 8 |
| 6 | 35 |
| 7 | 211 |
| 8 | 1459 |
| 9 | 11584 |
| 10 | 103605 |
| 11 | 1030805 |
| 12 | 11291237 |
| 13 | 135015896 |
| 14 | 1749915271 |
| 15 | 24435107047 |
| 16 | 365696282855 |
| 17 | 5839492221440 |
| 18 | 99096354764009 |
| 19 | 1780930394412009 |
| 20 | 33789956266629001 |
| 21 | 674939337282352360 |
| 22 | 14157377139256183723 |
| 23 | 311135096550816014651 |