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 | 9 |
| 3 | 44 |
| 4 | 244 |
| 5 | 1438 |
| 6 | 8858 |
| 7 | 56340 |
| 8 | 367160 |
| 9 | 2438934 |
| 10 | 16453015 |
| 11 | 112411836 |
| 12 | 776258588 |
| 13 | 5409237100 |
| 14 | 37988571802 |
| 15 | 268606426836 |
| 16 | 1910584687932 |
| 17 | 13661702623498 |
| 18 | 98148312810335 |
| 19 | 708092115326436 |
| 20 | 5127976641997944 |
| 21 | 37264674894021280 |
| 22 | 271650189521574734 |