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 | 3 |
| 2 | 31 |
| 3 | 96 |
| 4 | 223 |
| 5 | 765 |
| 6 | 7873 |
| 7 | 24384 |
| 8 | 56641 |
| 9 | 194307 |
| 10 | 1999711 |
| 11 | 6193440 |
| 12 | 14386591 |
| 13 | 49353213 |
| 14 | 507918721 |
| 15 | 1573109376 |
| 16 | 3654137473 |
| 17 | 12535521795 |
| 18 | 129009355423 |
| 19 | 399563588064 |
| 20 | 928136531551 |
| 21 | 3183973182717 |
| 22 | 32767868358721 |
| 23 | 101487578258880 |
| 24 | 235743024876481 |
| 25 | 808716652888323 |
| 26 | 8322909553759711 |
| 27 | 25777445314167456 |
| 28 | 59877800182094623 |
| 29 | 205410845860451325 |