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 | 2 |
| 4 | 6 |
| 5 | 8 |
| 6 | 26 |
| 7 | 38 |
| 8 | 130 |
| 9 | 202 |
| 10 | 712 |
| 11 | 1152 |
| 12 | 4144 |
| 13 | 6904 |
| 14 | 25202 |
| 15 | 42926 |
| 16 | 158442 |
| 17 | 274586 |
| 18 | 1022348 |
| 19 | 1796636 |
| 20 | 6736180 |
| 21 | 11974360 |
| 22 | 45154320 |
| 23 | 81040720 |
| 24 | 307069360 |
| 25 | 555620080 |
| 26 | 2113890560 |
| 27 | 3851817920 |
| 28 | 14705955008 |
| 29 | 26960013552 |
| 30 | 103245460226 |