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) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 17 |
| 5 | 48 |
| 6 | 245 |
| 7 | 850 |
| 8 | 3709 |
| 9 | 14016 |
| 10 | 57817 |
| 11 | 225890 |
| 12 | 912473 |
| 13 | 3610800 |
| 14 | 14470637 |
| 15 | 57541426 |
| 16 | 229912165 |
| 17 | 915917568 |
| 18 | 3655472497 |
| 19 | 14572774850 |
| 20 | 58135559777 |
| 21 | 231822774960 |
| 22 | 924665246117 |
| 23 | 3687589909522 |
| 24 | 14707675592461 |
| 25 | 58656853828800 |
| 26 | 233942936910025 |