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 | 7 |
| 3 | 68 |
| 4 | 1453 |
| 5 | 51974 |
| 6 | 2754739 |
| 7 | 202115720 |
| 8 | 19593627865 |
| 9 | 2424473303306 |
| 10 | 372795661540831 |
| 11 | 69721670054678732 |
| 12 | 15584255833611765637 |
| 13 | 4102656765126735657998 |
| 14 | 1256362298168756601126283 |
| 15 | 442800255547191861154809104 |
| 16 | 177962191835086481297819598769 |