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 | 1 |
| 5 | 3 |
| 6 | 6 |
| 7 | 14 |
| 8 | 30 |
| 9 | 70 |
| 10 | 165 |
| 11 | 397 |
| 12 | 961 |
| 13 | 2368 |
| 14 | 5875 |
| 15 | 14722 |
| 16 | 37134 |
| 17 | 94312 |
| 18 | 240823 |
| 19 | 618147 |
| 20 | 1593606 |
| 21 | 4125218 |
| 22 | 10717064 |
| 23 | 27934867 |
| 24 | 73032798 |
| 25 | 191464677 |
| 26 | 503218042 |
| 27 | 1325678981 |
| 28 | 3499913710 |
| 29 | 9258627528 |
| 30 | 24538328431 |
| 31 | 65147600774 |
| 32 | 173243773337 |
| 33 | 461400769439 |