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 | 1 |
| 3 | 2 |
| 4 | 2 |
| 5 | 3 |
| 6 | 5 |
| 7 | 7 |
| 8 | 11 |
| 9 | 22 |
| 10 | 42 |
| 11 | 77 |
| 12 | 176 |
| 13 | 385 |
| 14 | 1002 |
| 15 | 3010 |
| 16 | 8349 |
| 17 | 26015 |
| 18 | 105558 |
| 19 | 386155 |
| 20 | 1741630 |
| 21 | 9289091 |
| 22 | 49995925 |
| 23 | 304801365 |
| 24 | 2291320912 |
| 25 | 18440293320 |
| 26 | 172389800255 |
| 27 | 1987276856363 |
| 28 | 25025873760111 |
| 29 | 365749566870782 |
| 30 | 6965850144195831 |
| 31 | 144117936527873832 |