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 | 1 |
| 2 | 9 |
| 3 | 154 |
| 4 | 3705 |
| 5 | 115101 |
| 6 | 4395118 |
| 7 | 199448964 |
| 8 | 10495906641 |
| 9 | 628737007195 |
| 10 | 42254306265171 |
| 11 | 3148956023335200 |
| 12 | 257758558133120135 |
| 13 | 22991045919047089170 |
| 14 | 2219652431230209792300 |
| 15 | 230617851021799852486856 |
| 16 | 25657807699789594931790369 |
| 17 | 3043509929953923167586547335 |