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 | 2 |
| 3 | 3 |
| 4 | 7 |
| 5 | 13 |
| 6 | 31 |
| 7 | 65 |
| 8 | 156 |
| 9 | 351 |
| 10 | 849 |
| 11 | 1993 |
| 12 | 4866 |
| 13 | 11733 |
| 14 | 28921 |
| 15 | 70997 |
| 16 | 176560 |
| 17 | 438979 |
| 18 | 1100302 |
| 19 | 2761797 |
| 20 | 6969909 |
| 21 | 17625015 |
| 22 | 44742636 |
| 23 | 113822415 |
| 24 | 290416803 |
| 25 | 742486655 |
| 26 | 1902767481 |
| 27 | 4885201701 |
| 28 | 12567065582 |
| 29 | 32382099109 |
| 30 | 83580301371 |