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 | 0 |
| 2 | 1 |
| 3 | 10 |
| 4 | 44 |
| 5 | 341 |
| 6 | 1495 |
| 7 | 11584 |
| 8 | 50786 |
| 9 | 393515 |
| 10 | 1725229 |
| 11 | 13367926 |
| 12 | 58607000 |
| 13 | 454115969 |
| 14 | 1990912771 |
| 15 | 15426575020 |
| 16 | 67632427214 |
| 17 | 524049434711 |
| 18 | 2297511612505 |
| 19 | 17802254205154 |
| 20 | 78047762397956 |
| 21 | 604752593540525 |
| 22 | 2651326409917999 |
| 23 | 20543785926172696 |
| 24 | 90067050174814010 |