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 | 23 |
| 4 | 185 |
| 5 | 1721 |
| 6 | 15545 |
| 7 | 277689 |
| 8 | 5586105 |
| 9 | 113081529 |
| 10 | 2289863865 |
| 11 | 46369706169 |
| 12 | 986739675321 |
| 13 | 26376728842425 |
| 14 | 711906436354233 |
| 15 | 19221208539173049 |
| 16 | 518972365315281081 |
| 17 | 22132599848083154505 |
| 18 | 944314039112845753929 |
| 19 | 40290722114409383329353 |