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 | 2 |
| 2 | 5 |
| 3 | 15 |
| 4 | 50 |
| 5 | 177 |
| 6 | 652 |
| 7 | 2473 |
| 8 | 9594 |
| 9 | 37892 |
| 10 | 151846 |
| 11 | 615859 |
| 12 | 2523217 |
| 13 | 10427471 |
| 14 | 43415259 |
| 15 | 181941198 |
| 16 | 766841846 |
| 17 | 3248517320 |
| 18 | 13823977350 |
| 19 | 59067577266 |
| 20 | 253315964424 |
| 21 | 1089998388418 |
| 22 | 4704475230340 |
| 23 | 20361365646315 |
| 24 | 88351705071583 |
| 25 | 384280788724692 |
| 26 | 1675063399090659 |