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 | 0 |
| 1 | 1 |
| 2 | 136 |
| 3 | 2214 |
| 4 | 17472 |
| 5 | 78250 |
| 6 | 301104 |
| 7 | 823886 |
| 8 | 2236928 |
| 9 | 4842747 |
| 10 | 10642000 |
| 11 | 19488502 |
| 12 | 38683008 |
| 13 | 62750714 |
| 14 | 112048496 |
| 15 | 173245500 |
| 16 | 286330880 |
| 17 | 410343586 |
| 18 | 658613592 |
| 19 | 893878598 |
| 20 | 1367184000 |
| 21 | 1824083604 |
| 22 | 2650436272 |
| 23 | 3404837614 |
| 24 | 4952558592 |
| 25 | 6113296875 |
| 26 | 8534097104 |
| 27 | 10591107372 |