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 | 1 |
| 1 | 8 |
| 2 | 52 |
| 3 | 272 |
| 4 | 1266 |
| 5 | 5344 |
| 6 | 20992 |
| 7 | 77584 |
| 8 | 272727 |
| 9 | 917936 |
| 10 | 2975492 |
| 11 | 9328736 |
| 12 | 28391410 |
| 13 | 84122688 |
| 14 | 243265848 |
| 15 | 688008048 |
| 16 | 1906476351 |
| 17 | 5184024112 |
| 18 | 13851270944 |
| 19 | 36409640400 |
| 20 | 94255399886 |
| 21 | 240529147072 |
| 22 | 605574003464 |
| 23 | 1505340071744 |