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 | 22 |
| 3 | 174 |
| 4 | 896 |
| 5 | 3680 |
| 6 | 13152 |
| 7 | 42784 |
| 8 | 130048 |
| 9 | 375552 |
| 10 | 1041920 |
| 11 | 2799104 |
| 12 | 7323648 |
| 13 | 18743296 |
| 14 | 47079424 |
| 15 | 116367360 |
| 16 | 283639808 |
| 17 | 682950656 |
| 18 | 1626734592 |
| 19 | 3837657088 |
| 20 | 8975810560 |
| 21 | 20831010816 |
| 22 | 48005906432 |
| 23 | 109926416384 |
| 24 | 250248953856 |