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 | 8 |
| 2 | 25 |
| 3 | 20 |
| 4 | 51 |
| 5 | 140 |
| 6 | 280 |
| 7 | 621 |
| 8 | 1451 |
| 9 | 3189 |
| 10 | 7136 |
| 11 | 16179 |
| 12 | 36212 |
| 13 | 81254 |
| 14 | 182957 |
| 15 | 410889 |
| 16 | 922943 |
| 17 | 2074950 |
| 18 | 4662563 |
| 19 | 10476618 |
| 20 | 23545560 |
| 21 | 52912545 |
| 22 | 118903861 |
| 23 | 267210837 |
| 24 | 600490496 |
| 25 | 1349441183 |
| 26 | 3032538210 |
| 27 | 6814874446 |
| 28 | 15314690189 |
| 29 | 34415928927 |