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 | 6 |
| 3 | 21 |
| 4 | 71 |
| 5 | 196 |
| 6 | 532 |
| 7 | 1301 |
| 8 | 3101 |
| 9 | 6956 |
| 10 | 15217 |
| 11 | 31951 |
| 12 | 65670 |
| 13 | 130914 |
| 14 | 256150 |
| 15 | 489690 |
| 16 | 920905 |
| 17 | 1699693 |
| 18 | 3092751 |
| 19 | 5540571 |
| 20 | 9802091 |
| 21 | 17114237 |
| 22 | 29550346 |
| 23 | 50444952 |
| 24 | 85264328 |
| 25 | 142682505 |
| 26 | 236649524 |
| 27 | 389033014 |
| 28 | 634408230 |
| 29 | 1026350152 |
| 30 | 1648328017 |
| 31 | 2628254619 |