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) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 22 |
| 5 | 93 |
| 6 | 439 |
| 7 | 2267 |
| 8 | 12628 |
| 9 | 75119 |
| 10 | 473610 |
| 11 | 3146376 |
| 12 | 21923158 |
| 13 | 159610880 |
| 14 | 1210421617 |
| 15 | 9536525715 |
| 16 | 77885388296 |
| 17 | 658112437816 |
| 18 | 5743744103287 |
| 19 | 51701114086088 |
| 20 | 479340725109862 |
| 21 | 4572111104329002 |
| 22 | 44818226981293308 |
| 23 | 451062570619242508 |
| 24 | 4656687307250419533 |