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) |
|---|---|
| 7 | 1 |
| 8 | 21 |
| 9 | 231 |
| 10 | 1792 |
| 11 | 11067 |
| 12 | 58044 |
| 13 | 268940 |
| 14 | 1129999 |
| 15 | 4385136 |
| 16 | 15928948 |
| 17 | 54711958 |
| 18 | 179090772 |
| 19 | 562156203 |
| 20 | 1700628930 |
| 21 | 4978677738 |
| 22 | 14153099499 |
| 23 | 39180254316 |
| 24 | 105881154624 |
| 25 | 279906223856 |
| 26 | 725158329175 |
| 27 | 1844006226090 |
| 28 | 4608929551309 |
| 29 | 11336379967178 |
| 30 | 27469729015029 |