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) |
|---|---|
| 1 | 0 |
| 2 | 2 |
| 3 | 20 |
| 4 | 22 |
| 5 | 200 |
| 6 | 202 |
| 7 | 220 |
| 8 | 298 |
| 9 | 2000 |
| 10 | 2002 |
| 11 | 2020 |
| 12 | 2022 |
| 13 | 2200 |
| 14 | 2202 |
| 15 | 2980 |
| 16 | 20000 |
| 17 | 20002 |
| 18 | 20020 |
| 19 | 20022 |
| 20 | 20200 |
| 21 | 20220 |
| 22 | 22000 |
| 23 | 22002 |
| 24 | 22020 |
| 25 | 28998 |
| 26 | 29800 |
| 27 | 200000 |
| 28 | 200002 |
| 29 | 200020 |
| 30 | 200022 |
| 31 | 200200 |
| 32 | 200202 |
| 33 | 200220 |
| 34 | 202000 |
| 35 | 202002 |
| 36 | 202200 |
| 37 | 220000 |
| 38 | 220002 |
| 39 | 220020 |
| 40 | 220200 |
| 41 | 289980 |
| 42 | 298000 |
| 43 | 632522 |
| 44 | 2000000 |