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 | 10 |
| 2 | 99 |
| 3 | 1090 |
| 4 | 11880 |
| 5 | 129601 |
| 6 | 1413720 |
| 7 | 15421330 |
| 8 | 168220899 |
| 9 | 1835008570 |
| 10 | 20016873360 |
| 11 | 218350598401 |
| 12 | 2381839709040 |
| 13 | 25981886201050 |
| 14 | 283418908502499 |
| 15 | 3091626107326450 |
| 16 | 33724468272088440 |
| 17 | 367877524885646401 |
| 18 | 4012928305470021960 |
| 19 | 43774333835284595170 |
| 20 | 477504743882660524899 |
| 21 | 5208777848873981178730 |