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 | 20 |
| 3 | 44 |
| 4 | 111 |
| 5 | 120 |
| 6 | 171 |
| 7 | 200 |
| 8 | 210 |
| 9 | 220 |
| 10 | 290 |
| 11 | 440 |
| 12 | 520 |
| 13 | 1020 |
| 14 | 1110 |
| 15 | 1113 |
| 16 | 1200 |
| 17 | 1710 |
| 18 | 1914 |
| 19 | 2000 |
| 20 | 2010 |
| 21 | 2020 |
| 22 | 2030 |
| 23 | 2100 |
| 24 | 2145 |
| 25 | 2200 |
| 26 | 2220 |
| 27 | 2310 |
| 28 | 2420 |
| 29 | 2900 |
| 30 | 3220 |
| 31 | 3381 |
| 32 | 4004 |
| 33 | 4048 |
| 34 | 4400 |
| 35 | 4444 |
| 36 | 5200 |
| 37 | 5525 |
| 38 | 6120 |
| 39 | 7220 |
| 40 | 8280 |
| 41 | 9338 |