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 | 6 |
| 3 | 21 |
| 4 | 61 |
| 5 | 166 |
| 6 | 441 |
| 7 | 1161 |
| 8 | 3046 |
| 9 | 7981 |
| 10 | 20901 |
| 11 | 54726 |
| 12 | 143281 |
| 13 | 375121 |
| 14 | 982086 |
| 15 | 2571141 |
| 16 | 6731341 |
| 17 | 17622886 |
| 18 | 46137321 |
| 19 | 120789081 |
| 20 | 316229926 |
| 21 | 827900701 |
| 22 | 2167472181 |
| 23 | 5674515846 |
| 24 | 14856075361 |
| 25 | 38893710241 |
| 26 | 101825055366 |
| 27 | 266581455861 |
| 28 | 697919312221 |
| 29 | 1827176480806 |