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 | 8 |
| 4 | 44 |
| 5 | 215 |
| 6 | 1028 |
| 7 | 5040 |
| 8 | 25931 |
| 9 | 141394 |
| 10 | 818940 |
| 11 | 5030489 |
| 12 | 32670830 |
| 13 | 223561960 |
| 14 | 1606504121 |
| 15 | 12086613500 |
| 16 | 94951417768 |
| 17 | 777028092855 |
| 18 | 6609770035768 |
| 19 | 58333927746852 |
| 20 | 533203742855027 |
| 21 | 5039919479205198 |
| 22 | 49191925330095240 |