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 | 4 |
| 2 | 37 |
| 3 | 143 |
| 4 | 627 |
| 5 | 2767 |
| 6 | 11345 |
| 7 | 51706 |
| 8 | 223151 |
| 9 | 974387 |
| 10 | 4317835 |
| 11 | 18935262 |
| 12 | 83405497 |
| 13 | 367312087 |
| 14 | 1616039971 |
| 15 | 7119896616 |
| 16 | 31348982360 |
| 17 | 138041608632 |
| 18 | 607987526596 |
| 19 | 2677387312069 |
| 20 | 11791160763537 |
| 21 | 51928980096226 |
| 22 | 228692213910063 |