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 | 105 |
| 2 | 13440 |
| 3 | 229635 |
| 4 | 1720320 |
| 5 | 8203125 |
| 6 | 29393280 |
| 7 | 86472015 |
| 8 | 220200960 |
| 9 | 502211745 |
| 10 | 1050000000 |
| 11 | 2046152955 |
| 12 | 3762339840 |
| 13 | 6588594285 |
| 14 | 11068417920 |
| 15 | 17940234375 |
| 16 | 28185722880 |
| 17 | 43085560665 |
| 18 | 64283103360 |
| 19 | 93856532595 |
| 20 | 134400000000 |