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 | 5 |
| 3 | 14 |
| 4 | 63 |
| 5 | 152 |
| 6 | 637 |
| 7 | 1518 |
| 8 | 6319 |
| 9 | 15040 |
| 10 | 62565 |
| 11 | 148894 |
| 12 | 619343 |
| 13 | 1473912 |
| 14 | 6130877 |
| 15 | 14590238 |
| 16 | 60689439 |
| 17 | 144428480 |
| 18 | 600763525 |
| 19 | 1429694574 |
| 20 | 5946945823 |
| 21 | 14152517272 |
| 22 | 58868694717 |
| 23 | 140095478158 |
| 24 | 582740001359 |
| 25 | 1386802264320 |