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) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 6 |
| 4 | 17 |
| 5 | 48 |
| 6 | 143 |
| 7 | 426 |
| 8 | 1277 |
| 9 | 3828 |
| 10 | 11483 |
| 11 | 34446 |
| 12 | 103337 |
| 13 | 310008 |
| 14 | 930023 |
| 15 | 2790066 |
| 16 | 8370197 |
| 17 | 25110588 |
| 18 | 75331763 |
| 19 | 225995286 |
| 20 | 677985857 |
| 21 | 2033957568 |
| 22 | 6101872703 |
| 23 | 18305618106 |
| 24 | 54916854317 |
| 25 | 164750562948 |
| 26 | 494251688843 |
| 27 | 1482755066526 |
| 28 | 4448265199577 |
| 29 | 13344795598728 |
| 30 | 40034386796183 |