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) |
|---|---|
| 4 | 1 |
| 5 | 8 |
| 6 | 40 |
| 7 | 156 |
| 8 | 520 |
| 9 | 1552 |
| 10 | 4262 |
| 11 | 10960 |
| 12 | 26716 |
| 13 | 62276 |
| 14 | 139744 |
| 15 | 303412 |
| 16 | 640001 |
| 17 | 1315832 |
| 18 | 2644004 |
| 19 | 5204044 |
| 20 | 10052182 |
| 21 | 19086348 |
| 22 | 35672516 |
| 23 | 65708116 |
| 24 | 119409576 |
| 25 | 214289116 |
| 26 | 380068582 |
| 27 | 666723748 |
| 28 | 1157550524 |
| 29 | 1990230968 |
| 30 | 3390558072 |
| 31 | 5726064688 |
| 32 | 9590759624 |
| 33 | 15938198484 |
| 34 | 26289242026 |