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 | 25 |
| 2 | 121 |
| 3 | 3502 |
| 4 | 44900 |
| 5 | 825105 |
| 6 | 12777541 |
| 7 | 214404272 |
| 8 | 3462096250 |
| 9 | 56936675435 |
| 10 | 928191589611 |
| 11 | 15195150205442 |
| 12 | 248255790803800 |
| 13 | 4059868440913765 |
| 14 | 66362714338128081 |
| 15 | 1085006507030505012 |
| 16 | 17737586664000998550 |
| 17 | 289987159511252164095 |
| 18 | 4740808786041449060951 |