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 | 4 |
| 2 | 29 |
| 3 | 160 |
| 4 | 736 |
| 5 | 3173 |
| 6 | 12909 |
| 7 | 53145 |
| 8 | 213949 |
| 9 | 858525 |
| 10 | 3442745 |
| 11 | 13786177 |
| 12 | 55183473 |
| 13 | 220767853 |
| 14 | 883161809 |
| 15 | 3532951753 |