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 | 3 |
| 3 | 52 |
| 4 | 815 |
| 5 | 16806 |
| 6 | 363132 |
| 7 | 8471296 |
| 8 | 205501599 |
| 9 | 5164447210 |
| 10 | 133153140098 |
| 11 | 3506969720904 |
| 12 | 93973493327012 |
| 13 | 2554956958697248 |
| 14 | 70323373958110080 |
| 15 | 1956176944656294912 |
| 16 | 54916687591986040223 |
| 17 | 1554166975730511463794 |
| 18 | 44297812047491490990366 |