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 | 2 |
| 3 | 6 |
| 4 | 23 |
| 5 | 103 |
| 6 | 513 |
| 7 | 2762 |
| 8 | 15793 |
| 9 | 94776 |
| 10 | 591950 |
| 11 | 3824112 |
| 12 | 25431452 |
| 13 | 173453058 |
| 14 | 1209639642 |
| 15 | 8604450011 |
| 16 | 62300851632 |
| 17 | 458374397312 |
| 18 | 3421888118907 |
| 19 | 25887131596018 |
| 20 | 198244731603623 |
| 21 | 1535346218316422 |
| 22 | 12015325816028313 |
| 23 | 94944352095728825 |
| 24 | 757046484552152932 |
| 25 | 6087537591051072864 |