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 | 6 |
| 2 | 44 |
| 3 | 328 |
| 4 | 2448 |
| 5 | 18272 |
| 6 | 136384 |
| 7 | 1017984 |
| 8 | 7598336 |
| 9 | 56714752 |
| 10 | 423324672 |
| 11 | 3159738368 |
| 12 | 23584608256 |
| 13 | 176037912576 |
| 14 | 1313964867584 |
| 15 | 9807567290368 |
| 16 | 73204678852608 |
| 17 | 546407161659392 |
| 18 | 4078438577864704 |
| 19 | 30441879976280064 |