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 | 5 |
| 4 | 16 |
| 5 | 60 |
| 6 | 257 |
| 7 | 1218 |
| 8 | 6270 |
| 9 | 34530 |
| 10 | 201223 |
| 11 | 1230168 |
| 12 | 7836622 |
| 13 | 51738649 |
| 14 | 352457285 |
| 15 | 2468427794 |
| 16 | 17718840472 |
| 17 | 130027678901 |
| 18 | 973357030743 |
| 19 | 7418717413322 |
| 20 | 57477823445999 |
| 21 | 452035218046890 |
| 22 | 3604179615488962 |
| 23 | 29102380883498470 |
| 24 | 237748924887335003 |