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 | 4 |
| 5 | 9 |
| 6 | 20 |
| 7 | 48 |
| 8 | 115 |
| 9 | 286 |
| 10 | 719 |
| 11 | 1841 |
| 12 | 4755 |
| 13 | 12410 |
| 14 | 32558 |
| 15 | 85849 |
| 16 | 226980 |
| 17 | 601373 |
| 18 | 1594870 |
| 19 | 4232100 |
| 20 | 11230771 |
| 21 | 29798539 |
| 22 | 79034638 |
| 23 | 209526631 |
| 24 | 555172356 |
| 25 | 1470195001 |
| 26 | 3891131705 |
| 27 | 10292857772 |
| 28 | 27212082536 |
| 29 | 71905725130 |
| 30 | 189911518888 |