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 | 60 |
| 3 | 1562 |
| 4 | 29907 |
| 5 | 707903 |
| 6 | 15859323 |
| 7 | 354859954 |
| 8 | 8061851335 |
| 9 | 181382499259 |
| 10 | 4095897476480 |
| 11 | 92476840837163 |
| 12 | 2086314577400136 |
| 13 | 47096964973772265 |
| 14 | 1062921614745008697 |
| 15 | 23989328157229264043 |
| 16 | 541446343762904191567 |
| 17 | 12220135872229640539724 |