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 | 8 |
| 5 | 23 |
| 6 | 60 |
| 7 | 149 |
| 8 | 396 |
| 9 | 1050 |
| 10 | 2814 |
| 11 | 7571 |
| 12 | 20372 |
| 13 | 54879 |
| 14 | 147946 |
| 15 | 399002 |
| 16 | 1076312 |
| 17 | 2903613 |
| 18 | 7833652 |
| 19 | 21135287 |
| 20 | 57024772 |
| 21 | 153859830 |
| 22 | 415135862 |
| 23 | 1120101045 |
| 24 | 3022215348 |
| 25 | 8154444873 |
| 26 | 22002086130 |
| 27 | 59365425382 |
| 28 | 160178219728 |
| 29 | 432188727639 |