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 | 101 |
| 2 | 202 |
| 3 | 404 |
| 4 | 606 |
| 5 | 1212 |
| 6 | 2424 |
| 7 | 7272 |
| 8 | 21816 |
| 9 | 41208 |
| 10 | 84048 |
| 11 | 123624 |
| 12 | 144144 |
| 13 | 336336 |
| 14 | 288288 |
| 15 | 504504 |
| 16 | 432432 |
| 17 | 865368 |
| 18 | 864864 |
| 19 | 1009008 |
| 20 | 2378376 |
| 21 | 1729728 |
| 22 | 3459456 |
| 23 | 3027024 |
| 24 | 4756752 |
| 25 | 6054048 |
| 26 | 9081072 |
| 27 | 11099088 |
| 28 | 12108096 |
| 29 | 16648632 |
| 30 | 23207184 |
| 31 | 29405376 |
| 32 | 36324288 |