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 | 1 |
| 2 | 7 |
| 3 | 20 |
| 4 | 313 |
| 5 | 344 |
| 6 | 24634 |
| 7 | 86008 |
| 8 | 183349 |
| 9 | 3301264 |
| 10 | 132174038 |
| 11 | 69326344 |
| 12 | 3332927794 |
| 13 | 17361255440 |
| 14 | 108222173516 |
| 15 | 406589577424 |
| 16 | 26070625295573 |
| 17 | 8970328188896 |
| 18 | 55462481190898 |
| 19 | 1055714050810664 |
| 20 | 2169454884422962 |
| 21 | 91277283963562352 |
| 22 | 8046203518285051612 |
| 23 | 686567135431420560 |