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 | 2 |
| 4 | 20 |
| 5 | 138 |
| 6 | 505 |
| 7 | 1547 |
| 8 | 3759 |
| 9 | 8313 |
| 10 | 16350 |
| 11 | 30344 |
| 12 | 52470 |
| 13 | 87212 |
| 14 | 138255 |
| 15 | 212953 |
| 16 | 317065 |
| 17 | 461827 |
| 18 | 655724 |
| 19 | 915038 |
| 20 | 1251720 |
| 21 | 1688414 |
| 22 | 2241365 |
| 23 | 2941047 |
| 24 | 3808915 |
| 25 | 4884893 |
| 26 | 6196650 |
| 27 | 7795332 |
| 28 | 9715914 |
| 29 | 12022688 |
| 30 | 14759115 |
| 31 | 18004709 |
| 32 | 21812685 |
| 33 | 26280007 |
| 34 | 31471000 |
| 35 | 37502458 |