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 | 3 |
| 2 | 16 |
| 3 | 119 |
| 4 | 1070 |
| 5 | 10762 |
| 6 | 116546 |
| 7 | 1330923 |
| 8 | 15823388 |
| 9 | 194168612 |
| 10 | 2444224858 |
| 11 | 31422225930 |
| 12 | 411141476444 |
| 13 | 5460849893348 |
| 14 | 73474839110524 |
| 15 | 999764999592077 |
| 16 | 13738614091375204 |
| 17 | 190450074950481408 |
| 18 | 2660727794475865450 |