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 | 3 |
| 3 | 12 |
| 4 | 49 |
| 5 | 198 |
| 6 | 792 |
| 7 | 3146 |
| 8 | 12441 |
| 9 | 49062 |
| 10 | 193154 |
| 11 | 759696 |
| 12 | 2986458 |
| 13 | 11737820 |
| 14 | 46134090 |
| 15 | 181350630 |
| 16 | 713046345 |
| 17 | 2804421510 |
| 18 | 11033453970 |
| 19 | 43424181240 |
| 20 | 170965500030 |
| 21 | 673354218420 |
| 22 | 2652994345560 |
| 23 | 10456457024052 |
| 24 | 41227321016394 |