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 | 12 |
| 2 | 144 |
| 3 | 556 |
| 4 | 2239 |
| 5 | 7093 |
| 6 | 23091 |
| 7 | 79802 |
| 8 | 271023 |
| 9 | 906448 |
| 10 | 3057442 |
| 11 | 10340359 |
| 12 | 34870751 |
| 13 | 117557963 |
| 14 | 396686326 |
| 15 | 1338456663 |
| 16 | 4514922232 |
| 17 | 15230949488 |
| 18 | 51384415639 |
| 19 | 173349069871 |
| 20 | 584798251431 |
| 21 | 1972858125612 |
| 22 | 6655586739783 |