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 | 0 |
| 2 | 1 |
| 3 | 15 |
| 4 | 204 |
| 5 | 3940 |
| 6 | 113865 |
| 7 | 4662231 |
| 8 | 256485040 |
| 9 | 18226108944 |
| 10 | 1623855701385 |
| 11 | 177195820499335 |
| 12 | 23237493232953516 |
| 13 | 3605437233380095620 |
| 14 | 653193551573628900289 |
| 15 | 136634950180317224866335 |
| 16 | 32681589590709963123092160 |
| 17 | 8863149183726257535369633856 |