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 | 2 |
| 2 | 5 |
| 3 | 7 |
| 4 | 54 |
| 5 | 61 |
| 6 | 176 |
| 7 | 413 |
| 8 | 6784 |
| 9 | 13981 |
| 10 | 34746 |
| 11 | 48727 |
| 12 | 375835 |
| 13 | 424562 |
| 14 | 1224959 |
| 15 | 2874480 |
| 16 | 47216639 |
| 17 | 97307758 |
| 18 | 241832155 |
| 19 | 339139913 |
| 20 | 2615811546 |
| 21 | 2954951459 |
| 22 | 8525714464 |
| 23 | 20006380387 |
| 24 | 328627800656 |
| 25 | 677261981699 |
| 26 | 1683151764054 |
| 27 | 2360413745753 |
| 28 | 18206047984325 |