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 | 19 |
| 3 | 361 |
| 4 | 6859 |
| 5 | 130321 |
| 6 | 2476099 |
| 7 | 47045881 |
| 8 | 148305659 |
| 9 | 893871739 |
| 10 | 2817807521 |
| 11 | 4234136149 |
| 12 | 10350100679 |
| 13 | 16983563041 |
| 14 | 53538342899 |
| 15 | 80448586831 |
| 16 | 196651912901 |
| 17 | 322687697779 |
| 18 | 815211156289 |
| 19 | 1017228515081 |
| 20 | 1432001198261 |
| 21 | 1528523149789 |