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 | 0 |
| 3 | 0 |
| 4 | 2 |
| 5 | 1 |
| 6 | 5 |
| 7 | 4 |
| 8 | 9 |
| 9 | 10 |
| 10 | 25 |
| 11 | 46 |
| 12 | 121 |
| 13 | 240 |
| 14 | 619 |
| 15 | 1353 |
| 16 | 3286 |
| 17 | 7773 |
| 18 | 19044 |
| 19 | 45759 |
| 20 | 112243 |
| 21 | 273188 |
| 22 | 672172 |
| 23 | 1646147 |
| 24 | 4051732 |
| 25 | 9971377 |
| 26 | 24619307 |
| 27 | 60823008 |
| 28 | 150613157 |
| 29 | 373188952 |
| 30 | 926068847 |
| 31 | 2299616637 |
| 32 | 5716948683 |
| 33 | 14223867298 |
| 34 | 35422864104 |