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 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 7 |
| 5 | 15 |
| 6 | 43 |
| 7 | 131 |
| 8 | 468 |
| 9 | 1776 |
| 10 | 7559 |
| 11 | 34022 |
| 12 | 166749 |
| 13 | 853823 |
| 14 | 4682358 |
| 15 | 26720781 |
| 16 | 161074458 |
| 17 | 1004485751 |
| 18 | 6576974188 |
| 19 | 44322716809 |
| 20 | 311440019349 |
| 21 | 2247888977510 |
| 22 | 16819336465164 |
| 23 | 128915407382036 |
| 24 | 1021269823516449 |
| 25 | 8261243728564640 |
| 26 | 68848043979970646 |