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 | 5 |
| 5 | 22 |
| 6 | 96 |
| 7 | 419 |
| 8 | 1829 |
| 9 | 7984 |
| 10 | 34852 |
| 11 | 152137 |
| 12 | 664113 |
| 13 | 2899006 |
| 14 | 12654828 |
| 15 | 55241235 |
| 16 | 241140697 |
| 17 | 1052634608 |
| 18 | 4594992184 |
| 19 | 20058197793 |
| 20 | 87558647021 |
| 21 | 382213633910 |
| 22 | 1668450426280 |
| 23 | 7283169876691 |
| 24 | 31792711738525 |
| 25 | 138782499488832 |
| 26 | 605817532105276 |