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 | 2 |
| 3 | 4 |
| 4 | 11 |
| 5 | 34 |
| 6 | 102 |
| 7 | 296 |
| 8 | 851 |
| 9 | 2452 |
| 10 | 7085 |
| 11 | 20489 |
| 12 | 59241 |
| 13 | 171245 |
| 14 | 494973 |
| 15 | 1430710 |
| 16 | 4135527 |
| 17 | 11953991 |
| 18 | 34553692 |
| 19 | 99879234 |
| 20 | 288705927 |
| 21 | 834519021 |
| 22 | 2412219633 |
| 23 | 6972643768 |
| 24 | 20154781952 |
| 25 | 58258423000 |
| 26 | 168398935968 |
| 27 | 486765693153 |
| 28 | 1407021006061 |
| 29 | 4067065818560 |