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 | 3 |
| 2 | 6 |
| 3 | 15 |
| 4 | 34 |
| 5 | 80 |
| 6 | 185 |
| 7 | 431 |
| 8 | 1001 |
| 9 | 2328 |
| 10 | 5411 |
| 11 | 12580 |
| 12 | 29244 |
| 13 | 67985 |
| 14 | 158045 |
| 15 | 367411 |
| 16 | 854126 |
| 17 | 1985603 |
| 18 | 4615966 |
| 19 | 10730820 |
| 20 | 24946129 |
| 21 | 57992715 |
| 22 | 134816705 |
| 23 | 313410816 |
| 24 | 728591751 |
| 25 | 1693770328 |
| 26 | 3937538296 |
| 27 | 9153665985 |
| 28 | 21279691689 |
| 29 | 49469281395 |