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) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 33 |
| 3 | 387 |
| 4 | 4737 |
| 5 | 59523 |
| 6 | 761121 |
| 7 | 9854211 |
| 8 | 128772609 |
| 9 | 1694927619 |
| 10 | 22437369633 |
| 11 | 298419470979 |
| 12 | 3984500221569 |
| 13 | 53376363001731 |
| 14 | 717044895641121 |
| 15 | 9656091923587587 |
| 16 | 130310873022310401 |
| 17 | 1761872309456567811 |
| 18 | 23861153881099854369 |
| 19 | 323634591584064809859 |