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 | 7 |
| 2 | 140 |
| 3 | 2205 |
| 4 | 16408 |
| 5 | 78155 |
| 6 | 279972 |
| 7 | 823585 |
| 8 | 2097200 |
| 9 | 4783023 |
| 10 | 10000060 |
| 11 | 19487237 |
| 12 | 35831880 |
| 13 | 62748595 |
| 14 | 105413588 |
| 15 | 170859465 |
| 16 | 268435552 |
| 17 | 410338775 |
| 18 | 612220140 |
| 19 | 893871853 |
| 20 | 1280000120 |
| 21 | 1801088667 |
| 22 | 2494358020 |
| 23 | 3404825585 |