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 | 1 |
| 1 | 8 |
| 2 | 46 |
| 3 | 240 |
| 4 | 1215 |
| 5 | 6096 |
| 6 | 30508 |
| 7 | 152576 |
| 8 | 762925 |
| 9 | 3814680 |
| 10 | 19073466 |
| 11 | 95367408 |
| 12 | 476837131 |
| 13 | 2384185760 |
| 14 | 11920928920 |
| 15 | 59604644736 |
| 16 | 298023223833 |
| 17 | 1490116119336 |
| 18 | 7450580596870 |
| 19 | 37252902984560 |
| 20 | 186264514923031 |
| 21 | 931322574615408 |
| 22 | 4656612873077316 |
| 23 | 23283064365386880 |