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 | 3 |
| 1 | 8 |
| 2 | 21 |
| 3 | 54 |
| 4 | 140 |
| 5 | 365 |
| 6 | 954 |
| 7 | 2496 |
| 8 | 6533 |
| 9 | 17102 |
| 10 | 44772 |
| 11 | 117213 |
| 12 | 306866 |
| 13 | 803384 |
| 14 | 2103285 |
| 15 | 5506470 |
| 16 | 14416124 |
| 17 | 37741901 |
| 18 | 98809578 |
| 19 | 258686832 |
| 20 | 677250917 |
| 21 | 1773065918 |
| 22 | 4641946836 |
| 23 | 12152774589 |
| 24 | 31816376930 |
| 25 | 83296356200 |
| 26 | 218072691669 |
| 27 | 570921718806 |
| 28 | 1494692464748 |
| 29 | 3913155675437 |