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 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 6 |
| 5 | 15 |
| 6 | 45 |
| 7 | 93 |
| 8 | 223 |
| 9 | 444 |
| 10 | 944 |
| 11 | 1802 |
| 12 | 3721 |
| 13 | 6898 |
| 14 | 13530 |
| 15 | 25150 |
| 16 | 48047 |
| 17 | 87702 |
| 18 | 165173 |
| 19 | 298670 |
| 20 | 553292 |
| 21 | 995698 |
| 22 | 1815981 |
| 23 | 3242921 |
| 24 | 5872289 |
| 25 | 10406853 |
| 26 | 18630716 |
| 27 | 32879716 |
| 28 | 58391915 |
| 29 | 102371974 |
| 30 | 180622850 |
| 31 | 314943742 |
| 32 | 551841083 |
| 33 | 958011541 |
| 34 | 1667894139 |