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 | 7 |
| 3 | 37 |
| 4 | 215 |
| 5 | 1271 |
| 6 | 7651 |
| 7 | 46614 |
| 8 | 286599 |
| 9 | 1774630 |
| 10 | 11050897 |
| 11 | 69134572 |
| 12 | 434174819 |
| 13 | 2735565574 |
| 14 | 17283825370 |
| 15 | 109466361512 |
| 16 | 694764983463 |
| 17 | 4417771590123 |
| 18 | 28137563496298 |
| 19 | 179478199605550 |
| 20 | 1146342590242465 |
| 21 | 7330598365285470 |
| 22 | 46928753892901140 |