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 | 1 |
| 4 | 2 |
| 5 | 4 |
| 6 | 10 |
| 7 | 24 |
| 8 | 63 |
| 9 | 164 |
| 10 | 444 |
| 11 | 1204 |
| 12 | 3328 |
| 13 | 9233 |
| 14 | 25865 |
| 15 | 72734 |
| 16 | 205656 |
| 17 | 583320 |
| 18 | 1660318 |
| 19 | 4737540 |
| 20 | 13551165 |
| 21 | 38837535 |
| 22 | 111512229 |
| 23 | 320681604 |
| 24 | 923528963 |
| 25 | 2663057582 |
| 26 | 7688068638 |
| 27 | 22218350303 |
| 28 | 64272720521 |
| 29 | 186091334380 |
| 30 | 539237928902 |
| 31 | 1563731491958 |
| 32 | 4537823968645 |
| 33 | 13176960639940 |
| 34 | 38286514506439 |
| 35 | 111306880581963 |