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 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 2 |
| 5 | 5 |
| 6 | 15 |
| 7 | 32 |
| 8 | 99 |
| 9 | 210 |
| 10 | 650 |
| 11 | 1379 |
| 12 | 4268 |
| 13 | 9055 |
| 14 | 28025 |
| 15 | 59458 |
| 16 | 184021 |
| 17 | 390420 |
| 18 | 1208340 |
| 19 | 2563621 |
| 20 | 7934342 |
| 21 | 16833545 |
| 22 | 52099395 |
| 23 | 110534372 |
| 24 | 342101079 |
| 25 | 725803590 |
| 26 | 2246343710 |
| 27 | 4765855559 |
| 28 | 14750202128 |
| 29 | 31294112515 |
| 30 | 96854484845 |
| 31 | 205487024518 |
| 32 | 635977131241 |