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 | 3 |
| 2 | 16 |
| 3 | 81 |
| 4 | 392 |
| 5 | 1815 |
| 6 | 8112 |
| 7 | 35301 |
| 8 | 150544 |
| 9 | 632043 |
| 10 | 2620880 |
| 11 | 10759353 |
| 12 | 43804824 |
| 13 | 177105279 |
| 14 | 711809392 |
| 15 | 2846259405 |
| 16 | 11330543648 |
| 17 | 44929049811 |
| 18 | 177540878736 |
| 19 | 699402223137 |
| 20 | 2747583822760 |
| 21 | 10766828545767 |
| 22 | 42095796462896 |
| 23 | 164244726238389 |
| 24 | 639620518118448 |