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 | 55 |
| 5 | 149 |
| 6 | 404 |
| 7 | 1097 |
| 8 | 2981 |
| 9 | 8104 |
| 10 | 22027 |
| 11 | 59875 |
| 12 | 162755 |
| 13 | 442414 |
| 14 | 1202605 |
| 15 | 3269018 |
| 16 | 8886111 |
| 17 | 24154953 |
| 18 | 65659970 |
| 19 | 178482301 |
| 20 | 485165196 |
| 21 | 1318815735 |
| 22 | 3584912847 |
| 23 | 9744803447 |
| 24 | 26489122130 |
| 25 | 72004899338 |
| 26 | 195729609429 |
| 27 | 532048240602 |
| 28 | 1446257064292 |
| 29 | 3931334297145 |
| 30 | 10686474581525 |