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 | 11 |
| 2 | 41 |
| 3 | 131 |
| 4 | 227 |
| 5 | 557 |
| 6 | 1151 |
| 7 | 1787 |
| 8 | 6449 |
| 9 | 7433 |
| 10 | 35729 |
| 11 | 148667 |
| 12 | 180959 |
| 13 | 402761 |
| 14 | 407153 |
| 15 | 2339297 |
| 16 | 5522039 |
| 17 | 11158331 |
| 18 | 20831621 |
| 19 | 22441073 |
| 20 | 27681671 |
| 21 | 73452191 |
| 22 | 241563941 |
| 23 | 953758661 |
| 24 | 1444258271 |
| 25 | 1917281867 |
| 26 | 6822754391 |
| 27 | 15867287129 |
| 28 | 28265030429 |
| 29 | 40841580683 |
| 30 | 177858260357 |