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) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 10 |
| 4 | 29 |
| 5 | 80 |
| 6 | 224 |
| 7 | 624 |
| 8 | 1741 |
| 9 | 4855 |
| 10 | 13541 |
| 11 | 37765 |
| 12 | 105326 |
| 13 | 293751 |
| 14 | 819264 |
| 15 | 2284905 |
| 16 | 6372539 |
| 17 | 17772840 |
| 18 | 49567974 |
| 19 | 138243749 |
| 20 | 385558106 |
| 21 | 1075311210 |
| 22 | 2999014106 |
| 23 | 8364169855 |
| 24 | 23327445251 |
| 25 | 65059618751 |
| 26 | 181449530649 |