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 | 5 |
| 3 | 35 |
| 4 | 311 |
| 5 | 3377 |
| 6 | 43373 |
| 7 | 643475 |
| 8 | 10831151 |
| 9 | 203961377 |
| 10 | 4248732053 |
| 11 | 97006864835 |
| 12 | 2409006894311 |
| 13 | 64645920431057 |
| 14 | 1864195055263613 |
| 15 | 57489983163699635 |
| 16 | 1888035573701458271 |
| 17 | 65785247971229129537 |
| 18 | 2423878578219411790373 |
| 19 | 94161366504933859099235 |
| 20 | 3846438440798147117812631 |