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 | 1 |
| 2 | 3 |
| 3 | 22 |
| 4 | 96 |
| 5 | 817 |
| 6 | 3627 |
| 7 | 31006 |
| 8 | 137712 |
| 9 | 1177393 |
| 10 | 5229411 |
| 11 | 44709910 |
| 12 | 198579888 |
| 13 | 1697799169 |
| 14 | 7540806315 |
| 15 | 64471658494 |
| 16 | 286352060064 |
| 17 | 2448225223585 |
| 18 | 10873837476099 |
| 19 | 92968086837718 |
| 20 | 412919472031680 |
| 21 | 3530339074609681 |
| 22 | 15680066099727723 |
| 23 | 134059916748330142 |