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 | 3 |
| 1 | 16 |
| 2 | 110 |
| 3 | 862 |
| 4 | 7202 |
| 5 | 62206 |
| 6 | 547130 |
| 7 | 4861222 |
| 8 | 43437602 |
| 9 | 389374126 |
| 10 | 3496551050 |
| 11 | 31429889782 |
| 12 | 282673681202 |
| 13 | 2543086539646 |
| 14 | 22882895986970 |
| 15 | 205921649705542 |
| 16 | 1853172776808002 |
| 17 | 16677944639250766 |
| 18 | 150098449994526890 |
| 19 | 1350870791159844502 |
| 20 | 12157760826489618002 |