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 | 9 |
| 2 | 9 |
| 3 | 22 |
| 4 | 48 |
| 5 | 109 |
| 6 | 244 |
| 7 | 549 |
| 8 | 1233 |
| 9 | 2771 |
| 10 | 6226 |
| 11 | 13990 |
| 12 | 31435 |
| 13 | 70634 |
| 14 | 158713 |
| 15 | 356625 |
| 16 | 801329 |
| 17 | 1800570 |
| 18 | 4045844 |
| 19 | 9090929 |
| 20 | 20427132 |
| 21 | 45899349 |
| 22 | 103134901 |
| 23 | 231742019 |
| 24 | 520719590 |
| 25 | 1170046298 |
| 26 | 2629070167 |
| 27 | 5907467042 |
| 28 | 13273957953 |
| 29 | 29826312781 |
| 30 | 67019116473 |
| 31 | 150590587774 |