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 | 5 |
| 5 | 12 |
| 6 | 36 |
| 7 | 98 |
| 8 | 327 |
| 9 | 988 |
| 10 | 3392 |
| 11 | 10872 |
| 12 | 38795 |
| 13 | 129520 |
| 14 | 469662 |
| 15 | 1609176 |
| 16 | 5935728 |
| 17 | 20786804 |
| 18 | 77416352 |
| 19 | 274792342 |
| 20 | 1035050705 |
| 21 | 3719296036 |
| 22 | 14094000938 |
| 23 | 51119572738 |
| 24 | 195075365778 |
| 25 | 712918642042 |
| 26 | 2734475097609 |
| 27 | 10055531355652 |
| 28 | 38747262233793 |