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 | 0 |
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 4 |
| 5 | 9 |
| 6 | 20 |
| 7 | 48 |
| 8 | 115 |
| 9 | 285 |
| 10 | 717 |
| 11 | 1837 |
| 12 | 4753 |
| 13 | 12451 |
| 14 | 32878 |
| 15 | 87549 |
| 16 | 234654 |
| 17 | 632813 |
| 18 | 1715444 |
| 19 | 4672539 |
| 20 | 12780498 |
| 21 | 35091807 |
| 22 | 96684475 |
| 23 | 267223388 |
| 24 | 740690724 |
| 25 | 2058468449 |
| 26 | 5734614700 |
| 27 | 16011714519 |
| 28 | 44799497408 |
| 29 | 125587597723 |
| 30 | 352696619768 |
| 31 | 992168346445 |