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 | 1 |
| 2 | 5 |
| 3 | 9 |
| 4 | 29 |
| 5 | 65 |
| 6 | 181 |
| 7 | 441 |
| 8 | 1165 |
| 9 | 2929 |
| 10 | 7589 |
| 11 | 19305 |
| 12 | 49661 |
| 13 | 126881 |
| 14 | 325525 |
| 15 | 833049 |
| 16 | 2135149 |
| 17 | 5467345 |
| 18 | 14007941 |
| 19 | 35877321 |
| 20 | 91909085 |
| 21 | 235418369 |
| 22 | 603054709 |
| 23 | 1544728185 |
| 24 | 3956947021 |
| 25 | 10135859761 |
| 26 | 25963647845 |
| 27 | 66507086889 |
| 28 | 170361678269 |