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 | 1 |
| 4 | 2 |
| 5 | 3 |
| 6 | 7 |
| 7 | 13 |
| 8 | 32 |
| 9 | 73 |
| 10 | 190 |
| 11 | 488 |
| 12 | 1350 |
| 13 | 3741 |
| 14 | 10765 |
| 15 | 31311 |
| 16 | 92949 |
| 17 | 278840 |
| 18 | 847511 |
| 19 | 2599071 |
| 20 | 8044399 |
| 21 | 25082609 |
| 22 | 78758786 |
| 23 | 248803504 |
| 24 | 790411028 |
| 25 | 2523668997 |
| 26 | 8095146289 |
| 27 | 26076714609 |
| 28 | 84329102797 |
| 29 | 273694746208 |