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 | 3 |
| 2 | 8 |
| 3 | 21 |
| 4 | 54 |
| 5 | 138 |
| 6 | 352 |
| 7 | 897 |
| 8 | 2285 |
| 9 | 5820 |
| 10 | 14823 |
| 11 | 37752 |
| 12 | 96148 |
| 13 | 244872 |
| 14 | 623645 |
| 15 | 1588311 |
| 16 | 4045140 |
| 17 | 10302237 |
| 18 | 26237926 |
| 19 | 66823230 |
| 20 | 170186624 |
| 21 | 433434405 |
| 22 | 1103878665 |
| 23 | 2811378360 |
| 24 | 7160069791 |
| 25 | 18235396608 |
| 26 | 46442241368 |
| 27 | 118279949136 |
| 28 | 301237536249 |
| 29 | 767197263003 |