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 | 1 |
| 3 | 3 |
| 4 | 6 |
| 5 | 15 |
| 6 | 28 |
| 7 | 36 |
| 8 | 45 |
| 9 | 55 |
| 10 | 66 |
| 11 | 78 |
| 12 | 136 |
| 13 | 378 |
| 14 | 666 |
| 15 | 1128 |
| 16 | 1225 |
| 17 | 1378 |
| 18 | 2278 |
| 19 | 2346 |
| 20 | 2556 |
| 21 | 5778 |
| 22 | 12246 |
| 23 | 13366 |
| 24 | 22366 |
| 25 | 22578 |
| 26 | 35778 |
| 27 | 111156 |
| 28 | 222778 |
| 29 | 223446 |
| 30 | 333336 |
| 31 | 1113778 |
| 32 | 1222266 |
| 33 | 1457778 |
| 34 | 2235555 |
| 35 | 3557778 |
| 36 | 22227778 |
| 37 | 22234446 |
| 38 | 111116778 |
| 39 | 156777778 |
| 40 | 222446778 |