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 | 7 |
| 3 | 49 |
| 4 | 434 |
| 5 | 4116 |
| 6 | 41363 |
| 7 | 431445 |
| 8 | 4629851 |
| 9 | 50775347 |
| 10 | 566592411 |
| 11 | 6412416619 |
| 12 | 73428973184 |
| 13 | 849204106870 |
| 14 | 9904511238159 |
| 15 | 116368090860251 |
| 16 | 1375981128400665 |
| 17 | 16362074062371685 |
| 18 | 195540534817518299 |
| 19 | 2347344805869798781 |