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) |
|---|---|
| 2 | 1 |
| 3 | 9 |
| 4 | 40 |
| 5 | 171 |
| 6 | 703 |
| 7 | 2839 |
| 8 | 11346 |
| 9 | 45066 |
| 10 | 178330 |
| 11 | 704038 |
| 12 | 2775590 |
| 13 | 10933363 |
| 14 | 43048403 |
| 15 | 169463371 |
| 16 | 667090762 |
| 17 | 2626243774 |
| 18 | 10340952238 |
| 19 | 40727191246 |
| 20 | 160443432712 |
| 21 | 632240809054 |
| 22 | 2492136145078 |
| 23 | 9826353817510 |
| 24 | 38756552628820 |