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 | 5 |
| 2 | 55 |
| 3 | 905 |
| 4 | 19855 |
| 5 | 544505 |
| 6 | 17919055 |
| 7 | 687978905 |
| 8 | 30187495855 |
| 9 | 1490155456505 |
| 10 | 81732269223055 |
| 11 | 4931150091426905 |
| 12 | 324557348772511855 |
| 13 | 23141780973332248505 |
| 14 | 1776997406800302687055 |
| 15 | 146197529083891406394905 |
| 16 | 12829862285488250150167855 |
| 17 | 1196280147496701351115120505 |