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 | 3 |
| 2 | 7 |
| 3 | 31 |
| 4 | 211 |
| 5 | 2311 |
| 6 | 43891 |
| 7 | 1272811 |
| 8 | 16546531 |
| 9 | 976245271 |
| 10 | 36121074991 |
| 11 | 1119753324691 |
| 12 | 52628406260431 |
| 13 | 3526103219448811 |
| 14 | 186883470630786931 |
| 15 | 7662222295862264131 |
| 16 | 743235562698639620611 |
| 17 | 54256196077000692304531 |