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) |
|---|---|
| 1 | 0 |
| 2 | 51 |
| 3 | 1968 |
| 4 | 26214 |
| 5 | 195312 |
| 6 | 1007769 |
| 7 | 4035360 |
| 8 | 13421772 |
| 9 | 38742048 |
| 10 | 99999999 |
| 11 | 235794768 |
| 12 | 515978034 |
| 13 | 1060449936 |
| 14 | 2066104677 |
| 15 | 3844335936 |
| 16 | 6871947672 |
| 17 | 11858787648 |
| 18 | 19835929035 |
| 19 | 32268769776 |
| 20 | 51199999998 |
| 21 | 79428004656 |
| 22 | 120726921777 |
| 23 | 180115266144 |
| 24 | 264180754020 |