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 | 6 |
| 4 | 15 |
| 5 | 30 |
| 6 | 39 |
| 7 | 78 |
| 8 | 105 |
| 9 | 910 |
| 10 | 7735 |
| 11 | 18655 |
| 12 | 98605 |
| 13 | 214415 |
| 14 | 265031 |
| 15 | 283309 |
| 16 | 313937 |
| 17 | 373395 |
| 18 | 432419 |
| 19 | 440115 |
| 20 | 441285 |
| 21 | 497211 |
| 22 | 573287 |
| 23 | 658502 |
| 24 | 1035741 |
| 25 | 1198806 |