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 | 1 |
| 3 | 3 |
| 4 | 6 |
| 5 | 14 |
| 6 | 30 |
| 7 | 65 |
| 8 | 144 |
| 9 | 321 |
| 10 | 720 |
| 11 | 1626 |
| 12 | 3694 |
| 13 | 8428 |
| 14 | 19305 |
| 15 | 44371 |
| 16 | 102291 |
| 17 | 236450 |
| 18 | 547868 |
| 19 | 1272148 |
| 20 | 2959613 |
| 21 | 6897450 |
| 22 | 16100184 |
| 23 | 37635909 |
| 24 | 88095027 |
| 25 | 206458158 |
| 26 | 484399704 |
| 27 | 1137707979 |
| 28 | 2674734202 |
| 29 | 6293966627 |
| 30 | 14823002101 |
| 31 | 34937537185 |
| 32 | 82408390392 |
| 33 | 194515481823 |