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 | 6 |
| 2 | 36 |
| 3 | 114 |
| 4 | 361 |
| 5 | 1425 |
| 6 | 5625 |
| 7 | 20550 |
| 8 | 75076 |
| 9 | 282494 |
| 10 | 1062961 |
| 11 | 3953885 |
| 12 | 14707225 |
| 13 | 54963220 |
| 14 | 205406224 |
| 15 | 766145724 |
| 16 | 2857650849 |
| 17 | 10667504721 |
| 18 | 39821399809 |
| 19 | 148599935192 |
| 20 | 554524472896 |
| 21 | 2069606677336 |
| 22 | 7724225004001 |
| 23 | 28826640215153 |