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 | 4 |
| 2 | 14 |
| 3 | 46 |
| 4 | 130 |
| 5 | 332 |
| 6 | 830 |
| 7 | 2054 |
| 8 | 5108 |
| 9 | 12790 |
| 10 | 32146 |
| 11 | 80942 |
| 12 | 203898 |
| 13 | 513498 |
| 14 | 1292934 |
| 15 | 3254868 |
| 16 | 8193210 |
| 17 | 20623908 |
| 18 | 51914372 |
| 19 | 130680214 |
| 20 | 328953874 |
| 21 | 828059138 |
| 22 | 2084434524 |
| 23 | 5247046924 |
| 24 | 13208134738 |
| 25 | 33248182980 |
| 26 | 83693989466 |
| 27 | 210678694852 |