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 | 6 |
| 2 | 84 |
| 3 | 780 |
| 4 | 4200 |
| 5 | 15810 |
| 6 | 46956 |
| 7 | 118104 |
| 8 | 262800 |
| 9 | 532350 |
| 10 | 1001220 |
| 11 | 1773156 |
| 12 | 2988024 |
| 13 | 4829370 |
| 14 | 7532700 |
| 15 | 11394480 |
| 16 | 16781856 |
| 17 | 24143094 |
| 18 | 34018740 |
| 19 | 47053500 |
| 20 | 64008840 |
| 21 | 85776306 |
| 22 | 113391564 |
| 23 | 148049160 |
| 24 | 191118000 |
| 25 | 244157550 |
| 26 | 308934756 |