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 | 6 |
| 1 | 10 |
| 2 | 30 |
| 3 | 130 |
| 4 | 630 |
| 5 | 3130 |
| 6 | 15630 |
| 7 | 78130 |
| 8 | 390630 |
| 9 | 1953130 |
| 10 | 9765630 |
| 11 | 48828130 |
| 12 | 244140630 |
| 13 | 1220703130 |
| 14 | 6103515630 |
| 15 | 30517578130 |
| 16 | 152587890630 |
| 17 | 762939453130 |
| 18 | 3814697265630 |
| 19 | 19073486328130 |
| 20 | 95367431640630 |
| 21 | 476837158203130 |
| 22 | 2384185791015630 |
| 23 | 11920928955078130 |