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 | 0 |
| 2 | 3 |
| 3 | 12 |
| 4 | 40 |
| 5 | 98 |
| 6 | 253 |
| 7 | 540 |
| 8 | 1199 |
| 9 | 2415 |
| 10 | 4893 |
| 11 | 9268 |
| 12 | 17864 |
| 13 | 32421 |
| 14 | 59265 |
| 15 | 104632 |
| 16 | 184338 |
| 17 | 315414 |
| 18 | 540155 |
| 19 | 901845 |
| 20 | 1504173 |
| 21 | 2461932 |
| 22 | 4013511 |
| 23 | 6443170 |
| 24 | 10314675 |
| 25 | 16281749 |
| 26 | 25608450 |
| 27 | 39838855 |
| 28 | 61716941 |
| 29 | 94682665 |
| 30 | 144726102 |