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 | 2 |
| 2 | 5 |
| 3 | 9 |
| 4 | 119 |
| 5 | 122 |
| 6 | 828 |
| 7 | 4449 |
| 8 | 239 |
| 9 | 56403 |
| 10 | 145668 |
| 11 | 246046 |
| 12 | 3369960 |
| 13 | 3627003 |
| 14 | 23161315 |
| 15 | 128629846 |
| 16 | 13651680 |
| 17 | 1590277918 |
| 18 | 4241902555 |
| 19 | 6712571031 |
| 20 | 95420159401 |
| 21 | 107655263398 |
| 22 | 647549275812 |
| 23 | 3718150825791 |
| 24 | 584824319281 |
| 25 | 44827014819597 |
| 26 | 123471611274972 |
| 27 | 182714776311554 |
| 28 | 2701419604443960 |
| 29 | 3190610873034597 |
| 30 | 18094618450123325 |