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 | 7 |
| 2 | 56 |
| 3 | 364 |
| 4 | 2198 |
| 5 | 12292 |
| 6 | 65240 |
| 7 | 330262 |
| 8 | 1608866 |
| 9 | 7575967 |
| 10 | 34636896 |
| 11 | 154235319 |
| 12 | 670752411 |
| 13 | 2855122319 |
| 14 | 11917598512 |
| 15 | 48858820584 |
| 16 | 197008297955 |
| 17 | 782223365518 |
| 18 | 3061514606822 |
| 19 | 11822306812232 |
| 20 | 45080137355687 |
| 21 | 169865159676365 |
| 22 | 632916329409504 |
| 23 | 2333298558227399 |