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 | 1 |
| 2 | 2 |
| 3 | 5 |
| 4 | 7 |
| 5 | 26 |
| 6 | 59 |
| 7 | 203 |
| 8 | 262 |
| 9 | 1251 |
| 10 | 4015 |
| 11 | 21326 |
| 12 | 46667 |
| 13 | 254661 |
| 14 | 810650 |
| 15 | 3497261 |
| 16 | 4307911 |
| 17 | 25036816 |
| 18 | 104455175 |
| 19 | 756223041 |
| 20 | 2373124298 |
| 21 | 19741217425 |
| 22 | 101079211423 |
| 23 | 727295697386 |
| 24 | 1555670606195 |
| 25 | 11616989940751 |
| 26 | 59640620309950 |
| 27 | 488741952420351 |
| 28 | 1525866477571003 |