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 | 4 |
| 3 | 76 |
| 4 | 516 |
| 5 | 2172 |
| 6 | 6860 |
| 7 | 17904 |
| 8 | 40796 |
| 9 | 83976 |
| 10 | 159732 |
| 11 | 285220 |
| 12 | 483604 |
| 13 | 785316 |
| 14 | 1229436 |
| 15 | 1865192 |
| 16 | 2753580 |
| 17 | 3969104 |
| 18 | 5601636 |
| 19 | 7758396 |
| 20 | 10566052 |
| 21 | 14172940 |
| 22 | 18751404 |
| 23 | 24500256 |
| 24 | 31647356 |
| 25 | 40452312 |
| 26 | 51209300 |
| 27 | 64250004 |
| 28 | 79946676 |