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) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 66 |
| 3 | 435 |
| 4 | 1540 |
| 5 | 4005 |
| 6 | 8646 |
| 7 | 16471 |
| 8 | 28680 |
| 9 | 46665 |
| 10 | 72010 |
| 11 | 106491 |
| 12 | 152076 |
| 13 | 210925 |
| 14 | 285390 |
| 15 | 378015 |
| 16 | 491536 |
| 17 | 628881 |
| 18 | 793170 |
| 19 | 987715 |
| 20 | 1216020 |
| 21 | 1481781 |
| 22 | 1788886 |
| 23 | 2141415 |
| 24 | 2543640 |
| 25 | 3000025 |
| 26 | 3515226 |
| 27 | 4094091 |
| 28 | 4741660 |
| 29 | 5463165 |