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 | 1 |
| 2 | 7 |
| 3 | 26 |
| 4 | 97 |
| 5 | 364 |
| 6 | 1374 |
| 7 | 5214 |
| 8 | 19877 |
| 9 | 76076 |
| 10 | 292162 |
| 11 | 1125332 |
| 12 | 4345642 |
| 13 | 16819256 |
| 14 | 65226620 |
| 15 | 253403190 |
| 16 | 986022765 |
| 17 | 3842200140 |
| 18 | 14991031770 |
| 19 | 58558504620 |
| 20 | 228986816190 |
| 21 | 896300806440 |
| 22 | 3511441192740 |