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 | 4 |
| 2 | 9 |
| 3 | 50 |
| 4 | 105 |
| 5 | 616 |
| 6 | 1287 |
| 7 | 7601 |
| 8 | 15873 |
| 9 | 93819 |
| 10 | 195910 |
| 11 | 1158052 |
| 12 | 2418195 |
| 13 | 14294449 |
| 14 | 29849041 |
| 15 | 176444054 |
| 16 | 368442700 |
| 17 | 2177943781 |
| 18 | 4547886208 |
| 19 | 26883530748 |
| 20 | 56137003923 |
| 21 | 331837870408 |
| 22 | 692929213991 |
| 23 | 4096053203771 |
| 24 | 8553197751125 |