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 | 6 |
| 2 | 33 |
| 3 | 182 |
| 4 | 1020 |
| 5 | 5814 |
| 6 | 33649 |
| 7 | 197340 |
| 8 | 1170585 |
| 9 | 7012200 |
| 10 | 42364476 |
| 11 | 257854776 |
| 12 | 1579730984 |
| 13 | 9734161206 |
| 14 | 60290077905 |
| 15 | 375138262520 |
| 16 | 2343880406595 |
| 17 | 14699630061270 |
| 18 | 92502956574105 |
| 19 | 583920410197950 |
| 20 | 3696470074992240 |
| 21 | 23461536762704040 |
| 22 | 149270218961671548 |