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 | 5 |
| 3 | 11 |
| 4 | 60 |
| 5 | 371 |
| 6 | 431 |
| 7 | 2074774 |
| 8 | 2075205 |
| 9 | 4149979 |
| 10 | 10375163 |
| 11 | 24900305 |
| 12 | 60175773 |
| 13 | 85076078 |
| 14 | 145251851 |
| 15 | 230327929 |
| 16 | 1527219425 |
| 17 | 7866425054 |
| 18 | 9393644479 |
| 19 | 787538916811 |
| 20 | 5522166062156 |
| 21 | 11831871041123 |
| 22 | 17354037103279 |
| 23 | 29185908144402 |
| 24 | 46539945247681 |
| 25 | 401505470125850 |
| 26 | 2054067295876931 |