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 | 18 |
| 3 | 154 |
| 4 | 1689 |
| 5 | 22518 |
| 6 | 353211 |
| 7 | 6373053 |
| 8 | 130079286 |
| 9 | 2964644430 |
| 10 | 74663152896 |
| 11 | 2060033160771 |
| 12 | 61821589542329 |
| 13 | 2005535153907369 |
| 14 | 69957741972993120 |
| 15 | 2611812581931916545 |
| 16 | 103938147849788867430 |
| 17 | 4392991505873072541159 |