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 | 11 |
| 3 | 60 |
| 4 | 244 |
| 5 | 857 |
| 6 | 2787 |
| 7 | 8704 |
| 8 | 26624 |
| 9 | 80601 |
| 10 | 242803 |
| 11 | 729740 |
| 12 | 2190948 |
| 13 | 6575041 |
| 14 | 19727867 |
| 15 | 59186976 |
| 16 | 177565024 |
| 17 | 532699985 |
| 18 | 1598105787 |
| 19 | 4794324220 |
| 20 | 14382980660 |
| 21 | 43148951241 |
| 22 | 129446864371 |
| 23 | 388340605280 |
| 24 | 1165021829664 |