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 | 10 |
| 3 | 84 |
| 4 | 16452 |
| 5 | 15630 |
| 6 | 2176783854 |
| 7 | 5764808 |
| 8 | 35184374186504 |
| 9 | 2541865834899 |
| 10 | 1000000000001001010 |
| 11 | 3138428376732 |
| 12 | 1648446623609512552867179993036 |
| 13 | 3937376385699302 |
| 14 | 3214199700417740938226879430 |
| 15 | 16834112196028232574474331890 |
| 16 | 21267647932558653967613834469360799760 |