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 | 2 |
| 4 | 7 |
| 5 | 12 |
| 6 | 122 |
| 7 | 133 |
| 8 | 1332 |
| 9 | 14642 |
| 10 | 14763 |
| 11 | 15984 |
| 12 | 161052 |
| 13 | 162504 |
| 14 | 175704 |
| 15 | 1771562 |
| 16 | 1772893 |
| 17 | 1932624 |
| 18 | 19487172 |
| 19 | 19503144 |
| 20 | 19648344 |
| 21 | 21258744 |
| 22 | 214358882 |
| 23 | 214373523 |
| 24 | 214521264 |
| 25 | 216130564 |
| 26 | 233846064 |
| 27 | 2357947692 |
| 28 | 2358123384 |
| 29 | 2377434984 |
| 30 | 2572306584 |
| 31 | 25937424602 |