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 | 2 |
| 2 | 4 |
| 3 | 9 |
| 4 | 24 |
| 5 | 77 |
| 6 | 294 |
| 7 | 1309 |
| 8 | 6664 |
| 9 | 38177 |
| 10 | 243034 |
| 11 | 1701909 |
| 12 | 13001604 |
| 13 | 107601977 |
| 14 | 959021574 |
| 15 | 9157981309 |
| 16 | 93282431344 |
| 17 | 1009552482977 |
| 18 | 11568619292914 |
| 19 | 139931423833509 |
| 20 | 1781662223749884 |
| 21 | 23819069385695177 |
| 22 | 333601191667149054 |
| 23 | 4884673638115922509 |