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 | 1 |
| 1 | 6 |
| 2 | 21 |
| 3 | 60 |
| 4 | 156 |
| 5 | 384 |
| 6 | 912 |
| 7 | 2112 |
| 8 | 4800 |
| 9 | 10752 |
| 10 | 23808 |
| 11 | 52224 |
| 12 | 113664 |
| 13 | 245760 |
| 14 | 528384 |
| 15 | 1130496 |
| 16 | 2408448 |
| 17 | 5111808 |
| 18 | 10813440 |
| 19 | 22806528 |
| 20 | 47972352 |
| 21 | 100663296 |
| 22 | 210763776 |
| 23 | 440401920 |
| 24 | 918552576 |
| 25 | 1912602624 |
| 26 | 3976200192 |
| 27 | 8254390272 |
| 28 | 17112760320 |