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 | 1 |
| 2 | 8 |
| 3 | 40 |
| 4 | 176 |
| 5 | 748 |
| 6 | 3248 |
| 7 | 14280 |
| 8 | 63768 |
| 9 | 285296 |
| 10 | 1285688 |
| 11 | 5794436 |
| 12 | 26261224 |
| 13 | 119028156 |
| 14 | 541876608 |
| 15 | 2466620624 |
| 16 | 11267536496 |
| 17 | 51458718144 |
| 18 | 235690960392 |
| 19 | 1079212461992 |
| 20 | 4953659984000 |
| 21 | 22730713367468 |
| 22 | 104520944666808 |