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 | 2 |
| 3 | 7 |
| 4 | 37 |
| 5 | 118 |
| 6 | 155 |
| 7 | 273 |
| 8 | 2885 |
| 9 | 3158 |
| 10 | 6043 |
| 11 | 21287 |
| 12 | 112478 |
| 13 | 358721 |
| 14 | 471199 |
| 15 | 829920 |
| 16 | 8770399 |
| 17 | 9600319 |
| 18 | 18370718 |
| 19 | 64712473 |
| 20 | 341933083 |
| 21 | 1090511722 |
| 22 | 1432444805 |
| 23 | 2522956527 |
| 24 | 26662010075 |
| 25 | 29184966602 |
| 26 | 55846976677 |
| 27 | 196725896633 |
| 28 | 1039476459842 |
| 29 | 3315155276159 |