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 | 2 |
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 3 |
| 5 | 6 |
| 6 | 12 |
| 7 | 28 |
| 8 | 68 |
| 9 | 176 |
| 10 | 484 |
| 11 | 1409 |
| 12 | 4334 |
| 13 | 14002 |
| 14 | 47357 |
| 15 | 167157 |
| 16 | 614297 |
| 17 | 2345730 |
| 18 | 9290084 |
| 19 | 38092233 |
| 20 | 161436136 |
| 21 | 706061825 |
| 22 | 3182452003 |
| 23 | 14764717643 |
| 24 | 70429572474 |
| 25 | 345075959701 |
| 26 | 1734987079149 |
| 27 | 8943648710357 |
| 28 | 47228775626154 |