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 | 3 |
| 2 | 10 |
| 3 | 41 |
| 4 | 196 |
| 5 | 1007 |
| 6 | 5342 |
| 7 | 28821 |
| 8 | 157192 |
| 9 | 864155 |
| 10 | 4780018 |
| 11 | 26572097 |
| 12 | 148321356 |
| 13 | 830764807 |
| 14 | 4666890950 |
| 15 | 26283115053 |
| 16 | 148348809232 |
| 17 | 838944980531 |
| 18 | 4752575891162 |
| 19 | 26964373486425 |
| 20 | 153196621856212 |
| 21 | 871460014012703 |
| 22 | 4962895187697070 |
| 23 | 28292329581548741 |