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 | 14 |
| 2 | 105 |
| 3 | 594 |
| 4 | 2860 |
| 5 | 12402 |
| 6 | 49963 |
| 7 | 190570 |
| 8 | 696787 |
| 9 | 2463300 |
| 10 | 8472280 |
| 11 | 28481220 |
| 12 | 93914325 |
| 13 | 304597382 |
| 14 | 973877245 |
| 15 | 3075011478 |
| 16 | 9602753412 |
| 17 | 29695165110 |
| 18 | 91026167999 |
| 19 | 276833858530 |
| 20 | 835933445799 |
| 21 | 2507876305416 |