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 | 3 |
| 3 | 5 |
| 4 | 17 |
| 5 | 66 |
| 6 | 181 |
| 7 | 508 |
| 8 | 1283 |
| 9 | 3664 |
| 10 | 10812 |
| 11 | 31171 |
| 12 | 88565 |
| 13 | 245524 |
| 14 | 692416 |
| 15 | 1968532 |
| 16 | 5609977 |
| 17 | 15928174 |
| 18 | 44982196 |
| 19 | 127190716 |
| 20 | 360208608 |
| 21 | 1021611491 |
| 22 | 2896270245 |
| 23 | 8202605953 |
| 24 | 23226285083 |
| 25 | 65780006703 |
| 26 | 186369631872 |
| 27 | 528047092459 |
| 28 | 1495905404102 |
| 29 | 4237308534243 |