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 | 2 |
| 2 | 5 |
| 3 | 12 |
| 4 | 30 |
| 5 | 74 |
| 6 | 185 |
| 7 | 460 |
| 8 | 1150 |
| 9 | 2868 |
| 10 | 7170 |
| 11 | 17904 |
| 12 | 44760 |
| 13 | 111834 |
| 14 | 279585 |
| 15 | 698748 |
| 16 | 1746870 |
| 17 | 4366460 |
| 18 | 10916150 |
| 19 | 27287944 |
| 20 | 68219860 |
| 21 | 170541252 |
| 22 | 426353130 |
| 23 | 1065853432 |
| 24 | 2664633580 |
| 25 | 6661479944 |
| 26 | 16653699860 |
| 27 | 41633878200 |
| 28 | 104084695500 |
| 29 | 260210401530 |
| 30 | 650526003825 |