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 | 13 |
| 2 | 169 |
| 3 | 840 |
| 4 | 6510 |
| 5 | 46878 |
| 6 | 329952 |
| 7 | 2371090 |
| 8 | 16939450 |
| 9 | 120961040 |
| 10 | 864671390 |
| 11 | 6178621414 |
| 12 | 44150290200 |
| 13 | 315500062138 |
| 14 | 2254527357770 |
| 15 | 16110599565656 |
| 16 | 115124947986150 |
| 17 | 822671737926942 |
| 18 | 5878731842796456 |
| 19 | 42008857944366290 |