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 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 12 |
| 5 | 19 |
| 6 | 128 |
| 7 | 193 |
| 8 | 1600 |
| 9 | 2997 |
| 10 | 20224 |
| 11 | 37692 |
| 12 | 319488 |
| 13 | 552366 |
| 14 | 5164032 |
| 15 | 10853055 |
| 16 | 103268352 |
| 17 | 198691110 |
| 18 | 2199453696 |
| 19 | 4050806490 |
| 20 | 49934499840 |
| 21 | 102089892240 |
| 22 | 1176592711680 |
| 23 | 2471811316695 |
| 24 | 32489204613120 |
| 25 | 71282307214125 |
| 26 | 893769083781120 |
| 27 | 2351538388135125 |