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 | 1 |
| 2 | 3 |
| 3 | 12 |
| 4 | 59 |
| 5 | 339 |
| 6 | 2210 |
| 7 | 16033 |
| 8 | 127643 |
| 9 | 1103372 |
| 10 | 10269643 |
| 11 | 102225363 |
| 12 | 1082190554 |
| 13 | 12126858113 |
| 14 | 143268057587 |
| 15 | 1778283994284 |
| 16 | 23120054355195 |
| 17 | 314017850216371 |
| 18 | 4444972514600178 |
| 19 | 65435496909148513 |
| 20 | 999907522895563403 |
| 21 | 15832873029742458796 |
| 22 | 259377550023571768075 |