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 | 1 |
| 3 | 1 |
| 4 | 3 |
| 5 | 4 |
| 6 | 10 |
| 7 | 17 |
| 8 | 39 |
| 9 | 77 |
| 10 | 176 |
| 11 | 381 |
| 12 | 891 |
| 13 | 2057 |
| 14 | 4941 |
| 15 | 11915 |
| 16 | 29391 |
| 17 | 73058 |
| 18 | 184236 |
| 19 | 468330 |
| 20 | 1202349 |
| 21 | 3108760 |
| 22 | 8097518 |
| 23 | 21218776 |
| 24 | 55925742 |
| 25 | 148146312 |
| 26 | 394300662 |
| 27 | 1053929982 |
| 28 | 2828250002 |
| 29 | 7617271738 |
| 30 | 20584886435 |
| 31 | 55802753243 |