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) |
|---|---|
| 3 | 3 |
| 4 | 7 |
| 5 | 21 |
| 6 | 74 |
| 7 | 296 |
| 8 | 1315 |
| 9 | 6393 |
| 10 | 33645 |
| 11 | 190085 |
| 12 | 1145246 |
| 13 | 7318338 |
| 14 | 49376293 |
| 15 | 350384315 |
| 16 | 2606467211 |
| 17 | 20266981269 |
| 18 | 164306340566 |
| 19 | 1385709542808 |
| 20 | 12133083103491 |
| 21 | 110095025916745 |
| 22 | 1033601910417425 |
| 23 | 10024991744613469 |
| 24 | 100316367530768074 |
| 25 | 1034373400144455266 |