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 | 22 |
| 2 | 286 |
| 3 | 2860 |
| 4 | 24310 |
| 5 | 184756 |
| 6 | 1293292 |
| 7 | 8498776 |
| 8 | 53117350 |
| 9 | 318704100 |
| 10 | 1848483780 |
| 11 | 10418726760 |
| 12 | 57302997180 |
| 13 | 308554600200 |
| 14 | 1630931458200 |
| 15 | 8480843582640 |
| 16 | 43464323361030 |
| 17 | 219878341708740 |
| 18 | 1099391708543700 |
| 19 | 5439095821216200 |
| 20 | 26651569523959380 |
| 21 | 129450480544945560 |