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 | 189 |
| 2 | 21546 |
| 3 | 1928934 |
| 4 | 149767947 |
| 5 | 10598527863 |
| 6 | 703442942532 |
| 7 | 44583546335328 |
| 8 | 2730727849782933 |
| 9 | 162985193544670497 |
| 10 | 9536099260315021758 |
| 11 | 549348981049383669882 |
| 12 | 31261349005300855653759 |