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 | 1 |
| 2 | 130 |
| 3 | 2706 |
| 4 | 32226 |
| 5 | 315684 |
| 6 | 2961498 |
| 7 | 28544040 |
| 8 | 291590754 |
| 9 | 3194874900 |
| 10 | 37656861354 |
| 11 | 477018980928 |
| 12 | 6477756701010 |
| 13 | 94006723773564 |
| 14 | 1453236561824250 |
| 15 | 23855684885059944 |
| 16 | 414605141516228418 |
| 17 | 7607828522859788580 |
| 18 | 147012653519046471114 |
| 19 | 2984603478905797978320 |