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 | 0 |
| 5 | 0 |
| 6 | 8 |
| 7 | 118 |
| 8 | 802 |
| 9 | 3708 |
| 10 | 13280 |
| 11 | 39734 |
| 12 | 104000 |
| 13 | 244948 |
| 14 | 530632 |
| 15 | 1072776 |
| 16 | 2048056 |
| 17 | 3723314 |
| 18 | 6492342 |
| 19 | 10915254 |
| 20 | 17777372 |
| 21 | 28147380 |
| 22 | 43465356 |
| 23 | 65624634 |
| 24 | 97098802 |
| 25 | 141050688 |
| 26 | 201509798 |
| 27 | 283514112 |
| 28 | 393348562 |
| 29 | 538725268 |
| 30 | 729098516 |