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 | 2 |
| 2 | 6 |
| 3 | 22 |
| 4 | 54 |
| 5 | 182 |
| 6 | 310 |
| 7 | 1078 |
| 8 | 2102 |
| 9 | 5174 |
| 10 | 9270 |
| 11 | 29750 |
| 12 | 46134 |
| 13 | 144438 |
| 14 | 242742 |
| 15 | 504886 |
| 16 | 1029174 |
| 17 | 3126326 |
| 18 | 4699190 |
| 19 | 14136374 |
| 20 | 22524982 |
| 21 | 47690806 |
| 22 | 89633846 |
| 23 | 274183222 |
| 24 | 408400950 |
| 25 | 1079489590 |
| 26 | 1884795958 |
| 27 | 4300715062 |
| 28 | 7521940534 |
| 29 | 22554326070 |
| 30 | 31144260662 |
| 31 | 95568770102 |