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 | 645 |
| 2 | 33153 |
| 3 | 129921 |
| 4 | 157641 |
| 5 | 451905 |
| 6 | 656601 |
| 7 | 1608465 |
| 8 | 3020361 |
| 9 | 3370641 |
| 10 | 6212361 |
| 11 | 19092921 |
| 12 | 34487601 |
| 13 | 38790753 |
| 14 | 681942801 |
| 15 | 940492785 |
| 16 | 1109260545 |
| 17 | 1574300001 |
| 18 | 2693081973 |
| 19 | 3037396461 |
| 20 | 4160578521 |
| 21 | 6424683105 |
| 22 | 7384487181 |
| 23 | 13671360561 |
| 24 | 14966031345 |
| 25 | 15731001105 |