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 | 5 |
| 3 | 22 |
| 4 | 201 |
| 5 | 4216 |
| 6 | 162314 |
| 7 | 12329633 |
| 8 | 1831137521 |
| 9 | 528106112383 |
| 10 | 296848246952000 |
| 11 | 324932515409958655 |
| 12 | 692572885398506075946 |
| 13 | 2874785146216927021053015 |
| 14 | 23237716875160177498526082523 |
| 15 | 365789982527236500400197753931927 |
| 16 | 11212996751916827855636781928754023265 |