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 | 2 |
| 2 | 10 |
| 3 | 75 |
| 4 | 753 |
| 5 | 9534 |
| 6 | 146353 |
| 7 | 2647628 |
| 8 | 55251994 |
| 9 | 1308089217 |
| 10 | 34669446816 |
| 11 | 1017575959652 |
| 12 | 32778617719852 |
| 13 | 1150083357364646 |
| 14 | 43669478546754372 |
| 15 | 1784505372378097160 |
| 16 | 78098473768259907870 |
| 17 | 3645038134074497689782 |