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 | 2 |
| 2 | 5 |
| 3 | 13 |
| 4 | 34 |
| 5 | 108 |
| 6 | 415 |
| 7 | 1841 |
| 8 | 9381 |
| 9 | 53733 |
| 10 | 342086 |
| 11 | 2395481 |
| 12 | 18300250 |
| 13 | 151453434 |
| 14 | 1349856656 |
| 15 | 12890177378 |
| 16 | 131298281746 |
| 17 | 1420980348324 |
| 18 | 16283235530691 |
| 19 | 196958363484995 |
| 20 | 2507751773736087 |
| 21 | 33526171616091612 |