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 | 10 |
| 4 | 75 |
| 5 | 500 |
| 6 | 3149 |
| 7 | 19214 |
| 8 | 115031 |
| 9 | 680424 |
| 10 | 3992921 |
| 11 | 23305234 |
| 12 | 135514019 |
| 13 | 785892316 |
| 14 | 4549048229 |
| 15 | 26295995926 |
| 16 | 151857925039 |
| 17 | 876366840784 |
| 18 | 5055045581745 |
| 19 | 29148894792730 |
| 20 | 168045778127355 |
| 21 | 968679251764676 |
| 22 | 5583525654107645 |
| 23 | 32183666525389086 |
| 24 | 185514611981021959 |